I worked on an update of the source code for the LibreOffice extensions and templates website from Plone 5.0 to Plone 5.1 during last days. I finished this work today. The Plone buildout for the website points to Plone 5.1.6 yet.
I run tests against the new Plone version with data created with the currently used Plone version (5.0) and they succeeded all. The source code of the website is available at Github: https://github.com/tdf/extensions.libreoffice.org
The new Plone version 5.1 will be available at the LibreOffice extensions and templates website once the TDF infra team got time slot to checkout the Github repository and run buildout afterwards.