diff --git a/_includes/navbar.ext b/_includes/navbar.ext
index 2d607a0d6..5253505d4 100644
--- a/_includes/navbar.ext
+++ b/_includes/navbar.ext
@@ -36,7 +36,7 @@
               <a class="dropdown-toggle" data-toggle="dropdown" href="{{site.baseurl}}/index.html" id="communication_menu"><span class="glyphicon glyphicon-bullhorn"></span>&nbsp;&nbsp;Communication<span class="caret"></span></a>
                 <ul class="dropdown-menu" aria-labelledby="communication_menu">
                   <li><a href="{{ site.baseurl }}/future-events.html">Community Calendar</a></li>
-                  <li><a href="https://indico.cern.ch/category/5816/" target="_hsf_indico">Meetings: Indico</a></li>
+                  <li><a href="https://indico.cern.ch/category/5816/" target="_hsf_indico" rel="noopener noreferrer">Meetings: Indico</a></li>
                   <li><a href="{{ site.baseurl }}/Schools/events.html">Training Schools</a></li>
                   <li class="divider"></li>
                   <li><a href="{{ site.baseurl }}/forums.html">Mailing Lists and Forums</a></li>
@@ -47,7 +47,7 @@
                   <li class="divider"></li>
                   <li><a href="{{ site.baseurl }}/newsletter.html">Newsletters</a></li>
                   <li><a href="{{ site.baseurl }}/events.html">Events &amp; Workshops</a></li>
-                  <li><a href="https://www.youtube.com/c/HEPSoftwareFoundation" target="_hsf_youtube">HSF on YouTube</a></li>
+                  <li><a href="https://www.youtube.com/c/HEPSoftwareFoundation" target="_hsf_youtube" rel="noopener noreferrer">HSF on YouTube</a></li>
                   <li class="divider"></li>
 
                   <li><a href="{{ site.baseurl }}/inventory/inventory.html">HSF Project Inventory</a></li>
diff --git a/_layouts/main.html b/_layouts/main.html
index 49473b589..1d496031f 100644
--- a/_layouts/main.html
+++ b/_layouts/main.html
@@ -45,7 +45,7 @@
         <div class="col-lg-4">
           <h2>Meetings</h2>
           <p>
-            The HSF holds <a href="{{ '/future-events.html' | relative_url }}" target="_hsf_indico">regular meetings</a>
+            The HSF holds <a href="{{ '/future-events.html' | relative_url }}" target="_hsf_indico" rel="noopener noreferrer">regular meetings</a>
             in its activity areas and has bi-weekly coordination meetings as well.
             All are welcome to join these public meetings and other HSF activities.
           </p>
diff --git a/newsletter.html b/newsletter.html
index 1dd5a48ae..504628ae3 100644
--- a/newsletter.html
+++ b/newsletter.html
@@ -6,7 +6,7 @@
 <div>
 The HSF Newsletter is an occasional series of longer articles about the HSF,
 discussing workshops and other big activities. New newsletter articles are
-always announced on the <a href="http://groups.google.com/d/forum/hsf-forum">hsf-forum</a>.
+always announced on the <a href="https://groups.google.com/d/forum/hsf-forum">hsf-forum</a>.
 </div>
 <div class="row">
 
diff --git a/organization/cwp.md b/organization/cwp.md
index 908cde748..36f4fa0d6 100644
--- a/organization/cwp.md
+++ b/organization/cwp.md
@@ -10,8 +10,8 @@ redirect_from:
 
 # A Roadmap for HEP Software and Computing R&D for the 2020s
 
-In 2017 the HEP Software Foundation, [charged by the WLCG]({{ site.baseurl }}/assets/CWP-Charge-HSF.pdf){:target="_cwp_charge"}, produced a
-[roadmap white paper](https://doi.org/10.1007/s41781-018-0018-8){:target="_cwp_roadmap_csbs"} on the
+In 2017 the HEP Software Foundation, [charged by the WLCG]({{ site.baseurl }}/assets/CWP-Charge-HSF.pdf){:target="_cwp_charge" rel="noopener noreferrer"}, produced a
+[roadmap white paper](https://doi.org/10.1007/s41781-018-0018-8){:target="_cwp_roadmap_csbs" rel="noopener noreferrer"} on the
 software and computing challenges that will be faced during the next decade.
 This has been published in the journal
 [Computing and Software for Big Science](https://link.springer.com/journal/41781).
@@ -34,38 +34,38 @@ Working groups are in the process of [finalising and uploading]({{site.baseurl}}
 {:.table .table-hover .table-condensed .table-striped}
 | *Paper* | *Report Number* | *Link* |
 | ------- | --------------- | ------ |
-| CWP Roadmap | HSF-CWP-2017-01 | [arXiv](https://arxiv.org/abs/1712.06982){:target="_cwp_roadmap_arxiv"} |
-| Careers & Training	 | HSF-CWP-2017-02	| [arXiv](https://arxiv.org/abs/1807.02875){:target="_cwp_cst"} |
-| Conditions Data | HSF-CWP-2017-03	| [arXiv](https://arxiv.org/abs/1901.05429){:target="_cwp_cdb"} |
-| Data Organisation, Management and Access | HSF-CWP-2017-04	| [arXiv](https://arxiv.org/abs/1812.00761){:target="_cwp_doma"} |
-| Data Analysis and Interpretation | HSF-CWP-2017-05	| [arXiv](https://arxiv.org/abs/1804.03983){:target="_cwp_analysis"} |
-| Data and Software Preservation | HSF-CWP-2017-06 | [arXiv](https://arxiv.org/abs/1810.01191){:target="_cwp_dsp"} |
-| Detector Simulation | HSF-CWP-2017-07	| [arXiv](https://arxiv.org/abs/1803.04165){:target="_cwp_sim"} |
-| Event/Data Processing Frameworks | HSF-CWP-2017-08	| [arXiv](https://arxiv.org/abs/1812.07861){:target="_cwp_fwk"} |
-| Facilities and Distributed Computing | HSF-CWP-2017-09	| [Google Doc](https://docs.google.com/document/d/1dm5vxejQrKZ19Y-pBLaqBcI_Z_yEN6S0N3Z4UonoTn8/edit?usp=sharing){:target="_cwp_fdc"} |
-| Machine Learning | HSF-CWP-2017-10	| [arXiv](https://arxiv.org/abs/1807.02876){:target="_cwp_ml"} |
-| Physics Generators | - | No separate paper, see [CWP Roadmap](https://arxiv.org/abs/1712.06982){:target="_cwp_roadmap_arxiv"}, section 3.1 |
-| Security | - | No separate paper, see [CWP Roadmap](https://arxiv.org/abs/1712.06982){:target="_cwp_roadmap_arxiv"}, section 3.13 |
-| Software Development, Deployment and Validation | HSF-CWP-2017-13 | [arXiv](https://arxiv.org/abs/1712.07959){:target="_cwp_sddp"} |
-| Software Trigger and Event Reconstruction | HSF-CWP-2017-14	| [arXiv - Executive Summary](https://arxiv.org/abs/1802.08640){:target="_cwp_stersum"}; [arXiv - full document](https://arxiv.org/abs/1802.08638){:target="_cwp_ster"} |
-| Visualisation | HSF-CWP-2017-15 | [arXiv](https://arxiv.org/abs/1811.10309){:target="_cwp_visu"} |
+| CWP Roadmap | HSF-CWP-2017-01 | [arXiv](https://arxiv.org/abs/1712.06982){:target="_cwp_roadmap_arxiv" rel="noopener noreferrer"} |
+| Careers & Training	 | HSF-CWP-2017-02	| [arXiv](https://arxiv.org/abs/1807.02875){:target="_cwp_cst" rel="noopener noreferrer"} |
+| Conditions Data | HSF-CWP-2017-03	| [arXiv](https://arxiv.org/abs/1901.05429){:target="_cwp_cdb" rel="noopener noreferrer"} |
+| Data Organisation, Management and Access | HSF-CWP-2017-04	| [arXiv](https://arxiv.org/abs/1812.00761){:target="_cwp_doma" rel="noopener noreferrer"} |
+| Data Analysis and Interpretation | HSF-CWP-2017-05	| [arXiv](https://arxiv.org/abs/1804.03983){:target="_cwp_analysis" rel="noopener noreferrer"} |
+| Data and Software Preservation | HSF-CWP-2017-06 | [arXiv](https://arxiv.org/abs/1810.01191){:target="_cwp_dsp" rel="noopener noreferrer"} |
+| Detector Simulation | HSF-CWP-2017-07	| [arXiv](https://arxiv.org/abs/1803.04165){:target="_cwp_sim" rel="noopener noreferrer"} |
+| Event/Data Processing Frameworks | HSF-CWP-2017-08	| [arXiv](https://arxiv.org/abs/1812.07861){:target="_cwp_fwk" rel="noopener noreferrer"} |
+| Facilities and Distributed Computing | HSF-CWP-2017-09	| [Google Doc](https://docs.google.com/document/d/1dm5vxejQrKZ19Y-pBLaqBcI_Z_yEN6S0N3Z4UonoTn8/edit?usp=sharing){:target="_cwp_fdc" rel="noopener noreferrer"} |
+| Machine Learning | HSF-CWP-2017-10	| [arXiv](https://arxiv.org/abs/1807.02876){:target="_cwp_ml" rel="noopener noreferrer"} |
+| Physics Generators | - | No separate paper, see [CWP Roadmap](https://arxiv.org/abs/1712.06982){:target="_cwp_roadmap_arxiv" rel="noopener noreferrer"}, section 3.1 |
+| Security | - | No separate paper, see [CWP Roadmap](https://arxiv.org/abs/1712.06982){:target="_cwp_roadmap_arxiv" rel="noopener noreferrer"}, section 3.13 |
+| Software Development, Deployment and Validation | HSF-CWP-2017-13 | [arXiv](https://arxiv.org/abs/1712.07959){:target="_cwp_sddp" rel="noopener noreferrer"} |
+| Software Trigger and Event Reconstruction | HSF-CWP-2017-14	| [arXiv - Executive Summary](https://arxiv.org/abs/1802.08640){:target="_cwp_stersum" rel="noopener noreferrer"}; [arXiv - full document](https://arxiv.org/abs/1802.08638){:target="_cwp_ster" rel="noopener noreferrer"} |
+| Visualisation | HSF-CWP-2017-15 | [arXiv](https://arxiv.org/abs/1811.10309){:target="_cwp_visu" rel="noopener noreferrer"} |
 
 
 ## Talks
 
 This is a list of talks about the CWP Roadmap that were given by various HSF members:
 
-* 2018-02-23 [CWP Lessons and Future Work](https://indico.cern.ch/event/702775/contributions/2882384/attachments/1597819/2547448/HEP-Computing-After-CWP.pdf){:target="_cwp_pres"}
-  at [4th CERN Scientific Computing Forum](https://indico.cern.ch/event/663273/){:target="_scf_indico"} by Michel Jouvin
-* 2018-01-10 [Presentation](https://indico.cern.ch/event/651349/contributions/2830237/attachments/1580497/2497360/cwp-gdb-january-2018.pdf){:target="_cwp_pres"} at
+* 2018-02-23 [CWP Lessons and Future Work](https://indico.cern.ch/event/702775/contributions/2882384/attachments/1597819/2547448/HEP-Computing-After-CWP.pdf){:target="_cwp_pres" rel="noopener noreferrer"}
+  at [4th CERN Scientific Computing Forum](https://indico.cern.ch/event/663273/){:target="_scf_indico" rel="noopener noreferrer"} by Michel Jouvin
+* 2018-01-10 [Presentation](https://indico.cern.ch/event/651349/contributions/2830237/attachments/1580497/2497360/cwp-gdb-january-2018.pdf){:target="_cwp_pres" rel="noopener noreferrer"} at
  the [January 2018 GDB](https://indico.cern.ch/event/651349/) by Graeme Stewart.
-* 2017-01-05 [Talk](https://indico.cern.ch/event/666278/contributions/2830239/attachments/1579352/2495271/Advances_in_software_and_computing_for_HEP.pdf){:target="_cwp_pres"}
- at the [2018 Sp&aring;tlid Nordic Particle Physics Meeting](https://indico.cern.ch/event/666278/overview){:target="_sppm_agenda"} in Skeikampen, Norway
+* 2017-01-05 [Talk](https://indico.cern.ch/event/666278/contributions/2830239/attachments/1579352/2495271/Advances_in_software_and_computing_for_HEP.pdf){:target="_cwp_pres" rel="noopener noreferrer"}
+ at the [2018 Sp&aring;tlid Nordic Particle Physics Meeting](https://indico.cern.ch/event/666278/overview){:target="_sppm_agenda" rel="noopener noreferrer"} in Skeikampen, Norway
  by Graeme Stewart (covers HEP software and computing challenges in general, as well as the CWP).
-* 2017-11-28 [Presentation](https://indico.desy.de/indico/event/18681/session/8/contribution/114/material/slides/0.pdf){:target="_cwp_pres"} at
+* 2017-11-28 [Presentation](https://indico.desy.de/indico/event/18681/session/8/contribution/114/material/slides/0.pdf){:target="_cwp_pres" rel="noopener noreferrer"} at
 the [11th Terascale Alliance Workshop](https://indico.desy.de/indico/event/18681/) by Benedikt Hegner.
-* 2017-10-29 [Presentation](https://indico.cern.ch/event/663273/contributions/2708178/attachments/1545100/2431717/HSF-CWP-Roadmap.pdf){:target="_cwp_pres"}
- on the CWP Roadmap at the [3rd CERN Scientific Computing Forum](https://indico.cern.ch/event/663273/){:target="_scf_indico"} by Graeme Stewart.
+* 2017-10-29 [Presentation](https://indico.cern.ch/event/663273/contributions/2708178/attachments/1545100/2431717/HSF-CWP-Roadmap.pdf){:target="_cwp_pres" rel="noopener noreferrer"}
+ on the CWP Roadmap at the [3rd CERN Scientific Computing Forum](https://indico.cern.ch/event/663273/){:target="_scf_indico" rel="noopener noreferrer"} by Graeme Stewart.
 
 ## History
 
diff --git a/organization/goals.md b/organization/goals.md
index 70c8f17e7..cbadb864f 100644
--- a/organization/goals.md
+++ b/organization/goals.md
@@ -23,7 +23,7 @@ The objectives of the HSF are to:
 
 In 2017 the HSF organised a [Community White Paper]({{ site.baseurl }}/cwp.html)
 initiative, which resulted in the publication of a [Roadmap for HEP
-Computing](https://arxiv.org/abs/1712.06982){:target="_cwp_roadmap_arxiv"}. This
+Computing](https://arxiv.org/abs/1712.06982){:target="_cwp_roadmap_arxiv" rel="noopener noreferrer"}. This
 document laid out the software and computing challenges that would be faced
 during the next decade and the roadmap of R&D that would needed to face them
 successfully.  
diff --git a/organization/presentations.md b/organization/presentations.md
index 98475cca6..8b8ea14ad 100644
--- a/organization/presentations.md
+++ b/organization/presentations.md
@@ -89,7 +89,7 @@ Appleton Lab Particle Physics Division Serminar](https://indico.stfc.ac.uk/event
 
 * [Hep Software Foundation and Community White Paper](https://indico.desy.de/getFile.py/access?contribId=17&sessionId=7&resId=0&materialId=slides&confId=15730), at the [10th Annual Meeting of the Helmholtz Alliance](https://indico.desy.de/conferenceOtherViews.py?view=standard&confId=15730), Nov 22-23, 2016, Frank Gaede
 * [Challenges in the HEP SW Landscape](https://indico.desy.de/event/16073/contributions/21277/attachments/14131/17989/HEP_Software_Hegner.pdf) at the [2016 KET-Meeting](https://indico.desy.de/conferenceDisplay.py?confId=16073), 18 Nov 2016, Benedikt Hegner
-* [Community White Paper: A Roadmap for HEP Software and Computing - Status and Plans](https://indico.cern.ch/event/505613/contributions/2323238/attachments/1352966/2043354/20161011-chep-cwp-plenary.pdf) at [CHEP 2016](http://chep2016.org), 11 Oct 2016, Peter Elmer
+* [Community White Paper: A Roadmap for HEP Software and Computing - Status and Plans](https://indico.cern.ch/event/505613/contributions/2323238/attachments/1352966/2043354/20161011-chep-cwp-plenary.pdf) at [CHEP 2016](https://chep2016.org), 11 Oct 2016, Peter Elmer
 * [Community White Paper: A Roadmap for HEP Software and Computing - Status and Plans](https://indico.cern.ch/event/555063/contributions/2330979/attachments/1350889/2039355/20161009-wlcg-pre-chep-cwp.pdf) at [WLCG Workshop 2016](https://indico.cern.ch/event/555063/), 9 Oct 2016, Peter Elmer
 * [Developing the Roadmap for HL-LHC Software](https://indico.cern.ch/event/524795/contributions/2236597/attachments/1347925/2033396/LHC-Software-Roadmap.pdf)
    at the [ECFA HL-LHC Experiments Workshop](https://indico.cern.ch/event/524795/timetable/), 3-6 Oct 2016, Pere Mato
diff --git a/projects/projects.md b/projects/projects.md
index 2187613f2..76b4e5bf3 100644
--- a/projects/projects.md
+++ b/projects/projects.md
@@ -23,7 +23,7 @@ These are older projects that were associated with the HSF before the current af
 | CondDB [Client](https://github.com/BNLNPPS/nopayloadclient/) [Server](https://github.com/BNLNPPS/nopayloaddb) | Conditions Database implementation following the [HSF CondDB]({{ site.baseurl }}/activities/conditionsdb.html) recommendations | Apache-2 | [Lino Gerlach](mailto:lino.oscar.gerlach@cern.ch) and [Ruslan Mashinistov](mailto:ruslan.mashinistov@cern.ch) |
 | [DD4hep](https://github.com/AIDASoft/DD4hep)   | Generic Detector Description toolkit for HEP  | LGPL v3 | [Markus Frank](mailto:marks.frank@cern.ch) |
 | [fads](https://pkg.go.dev/go-hep.org/x/hep/fads?tab=doc)          | FAst Detector Simulation  | BSD-3 | [Sebastien Binet](mailto:binet@cern.ch) |  
-| [Gaudi](http://gaudi.web.cern.ch/gaudi/)          | Event data processing framework | Apache-2 | [Marco Clemencic](mailto:marco.clemencic@cern.ch) |  
+| [Gaudi](https://gaudi.web.cern.ch/gaudi/)          | Event data processing framework | Apache-2 | [Marco Clemencic](mailto:marco.clemencic@cern.ch) |  
 | [HepMC3](https://gitlab.cern.ch/hepmc/HepMC3) | C++ Event Record for Monte Carlo Generators | LGPL v3 | [Witek Pokorski](mailto:witold.pokorski@cern.ch) |
 | [Phoenix](https://github.com/HSF/phoenix) | Event display framework | Apache-2 | [Ed Moyse](mailto:Edward.Moyse@cern.ch) |
 | [podio](https://github.com/AIDASoft/podio) | Event Data Model Library based on plain-old-data | GPL v3 | [Benedikt Hegner](mailto:benedikt.hegner@cern.ch) |
diff --git a/technical_notes.md b/technical_notes.md
index 70d779853..d72e7a359 100644
--- a/technical_notes.md
+++ b/technical_notes.md
@@ -19,11 +19,11 @@ Final PDF files are copied to the main hepsoftwarefoundation.org website.
 | ------------- | ------------- | ------------ |---------------|
 | HSF-TN-2020-01  | Proposal for HSF Project Best Practices | B. Hegner, B. Morgan, G.A. Stewart | [DOI](https://doi.org/10.5281/zenodo.3965581) [PDF]({{ site.baseurl }}/notes/HSF-TN-2020-01.pdf) [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2020-01) |
 | HSF-TN-2018-01  | HSF Platform Naming Conventions | B. Hegner | [DOI](https://doi.org/10.5281/zenodo.1472351) [PDF]({{ site.baseurl }}/notes/HSF-TN-2018-01.pdf) [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2018-01) |
-| HSF-TN-2016-04 | Vacuum Platform | A. McNab | [DOI](http://doi.org/10.5281/zenodo.1469634) [PDF]({{ site.baseurl }}/notes/HSF-TN-2016-04.pdf) [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2016-04) |
+| HSF-TN-2016-04 | Vacuum Platform | A. McNab | [DOI](https://doi.org/10.5281/zenodo.1469634) [PDF]({{ site.baseurl }}/notes/HSF-TN-2016-04.pdf) [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2016-04) |
 | HSF-TN-2016-03  | HSF Packaging Working Group Report  | B. Hegner, L. Sexton-Kennedy | [DOI](https://doi.org/10.5281/zenodo.1472340) [PDF]({{ site.baseurl }}/notes/HSF-TN-2016-03.pdf)  [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2016-03) |
-| HSF-TN-2016-02  | Machine/Job Features  | M. Alef et al.| [DOI](http://doi.org/10.5281/zenodo.1469629) [PDF]({{ site.baseurl }}/notes/HSF-TN-2016-02.pdf)  [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2016-02) |
-| HSF-TN-2016-01  | Software Licence Agreements HSF Policy Guidelines  | J. Harvey et al. | [DOI](http://doi.org/10.5281/zenodo.1469636) [PDF]({{ site.baseurl }}/notes/HSF-TN-2016-01.pdf)  [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2016-01) |
-| HSF-TN-2015-01  | HSF Technical Notes policy | A. McNab | [DOI](http://doi.org/10.5281/zenodo.1469623) [PDF]({{ site.baseurl }}/notes/HSF-TN-2015-01.pdf)  [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2015-01) |
+| HSF-TN-2016-02  | Machine/Job Features  | M. Alef et al.| [DOI](https://doi.org/10.5281/zenodo.1469629) [PDF]({{ site.baseurl }}/notes/HSF-TN-2016-02.pdf)  [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2016-02) |
+| HSF-TN-2016-01  | Software Licence Agreements HSF Policy Guidelines  | J. Harvey et al. | [DOI](https://doi.org/10.5281/zenodo.1469636) [PDF]({{ site.baseurl }}/notes/HSF-TN-2016-01.pdf)  [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2016-01) |
+| HSF-TN-2015-01  | HSF Technical Notes policy | A. McNab | [DOI](https://doi.org/10.5281/zenodo.1469623) [PDF]({{ site.baseurl }}/notes/HSF-TN-2015-01.pdf)  [GitHub](https://github.com/HSF/documents/tree/master/HSF-TN/2015-01) |
 
 ### How to obtain a DOI for publication
 
@@ -40,7 +40,7 @@ It is a good idea to also add a README file with information on how to cite the
 
 ## Drafts in the consultation stage
 
-Before being assigned an HSF reference and being archived in their final form, final drafts are published on the [hsf-forum](http://groups.google.com/d/forum/hsf-forum) mailing list. In most cases, this consultation stage is intended to cover the formatting and language quality of the notes, rather than the substantive content which has already been decided by the relevant HSF activity or external project.
+Before being assigned an HSF reference and being archived in their final form, final drafts are published on the [hsf-forum](https://groups.google.com/d/forum/hsf-forum) mailing list. In most cases, this consultation stage is intended to cover the formatting and language quality of the notes, rather than the substantive content which has already been decided by the relevant HSF activity or external project.
 
 {:.table .table-hover .table-condensed .table-striped}
 | Draft TN Reference  | Title           | Authors     | Ends    | Download    |