Direct Messaging

Applications with this capability — Send private messages to individuals or small groups.

Proprietary:

Open Source:

C
Chatto
2.3k·AGPL-3.0-or-later (Apache-2.0 exceptions)
8 feats
diaspora*
13.7k·AGPL-3.0
7 feats
Zulip
25.8k·Apache-2.0
8 feats
S
Stoat
3.3k·AGPL-3.0-or-later (backend/web; MIT library exceptions; required MongoDB runtime SSPL-1.0)
14 feats