To be updated:
There may be others, I just came across those two.
Thanks for the feedback @MagicFab
Published in https://matomo.org/blog/2016/01/announcing-long-term-support-in-matomo-the-analytics-platform-for-your-mission-critical-projects/
Quickly mentioned in https://matomo.org/faq/new-to-piwik/faq_18925/ as well