I hope we can support it on Cloudron. Non-Self-hosted text, image, audio and video hosting is all being censored.
A key feature of these tools should be that they support federation/distributed content, so that people who want to support an image or text or whatever, are able to easily click and have that content provided by their own instance.
Not opensource, see :
"Your amendments to the GNU License has some scary language"
https://github.com/linagora/Twake/issues/584
and
"Licence enforcing Linagora/Twake advertisements on every outbound messages(mails, meeting requests)"
https://github.com/linagora/Twake/issues/675