Cwtch
5.0 out of 5 stars (based on 1 review)
Cwtch is decentralized and focused on metadata-privacy in addition
זוך רעזולטאַטן פֿאַר: communication
berty.tech
5.0 out of 5 stars (based on 1 review)
With a strong encryption protocol (E2EE), communicating with Berty
Bitmask
4.0 out of 5 stars (based on 1 review)
Bitmask is an open source application to provide easy and secure
Systemli.org
4.0 out of 5 stars (based on 1 review)
Systemli.org is a left-wing network and technics-collective that was
OpenDesktop.org
2.3 out of 5 stars (based on 3 reviews)
...freedom with all the services: Products, Projects, Files,
OnlyOffice
4.0 out of 5 stars (based on 1 review)
OnlyOffice (formerly TeamLab), stylized as ONLYOFFICE, is a free
senfcall.de
5.0 out of 5 stars (based on 1 review)
Add your mustard (german: “Senf”) Many claim:
HAL (open archive)
3.0 out of 5 stars (based on 1 review)
HAL is an open archive where authors can deposit scholarly documents
Jami
5.0 out of 5 stars (based on 1 review)
...which requires no central server. However, Jami still has to use
Hubzilla
4.0 out of 5 stars (based on 2 reviews)
Hubzilla is a general purpose communication server