Chat
Balsa
Email utility
Claws Mail
Lightweight and Fast GTK+ based Mail Client
Birdtray
System tray new mail notification for Thunderbird
GNOME GMail
Integrate GMail with your desktop
Phone Manager
Receive and send text messages from your mobile phone
Jami
Gnome client for Jami
Gnubiff
Gnubiff is a mail notification program.
HexChat
IRC Client
qTox
Powerful Tox chat client that follows the Tox design guidelines.
KVIrc
Connect to Internet Relay Chat
Loqui
IRC client
Mumble
A low-latency, high quality voice chat program for gaming
Notmuch (emacs interface)
Emacs based email client
Evolution
Manage your email, contacts and schedule
Geary
Send and receive email
Polari
An Internet Relay Chat Client for GNOME
KMail
A feature-rich email application
Konversation
IRC client
KTnef
A viewer/extractor for TNEF files
PIM Data Exporter
Saves all data from PIM apps and restore them in other systems.
PCManX BBS Client
PCManX BBS Client
puremail
Read/Write Mail/News with puremail
Quassel IRC (Client only)
Distributed IRC client with central core component
Quassel IRC
Distributed IRC client with central core component