Vanilla Forums - Build an engaging community forum using Vanilla's modern cloud forum software.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Forumbee - Forumbee offers community forums for discussions, feedback and Q&A.
Geary - Geary is an email application built for GNOME 3.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.