Kopete is KDE’s instant messaging (IM) client. The software is designed to be modular and plugin based.
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Category: Internet
Element – Matrix client with an emphasis on performance and usability
Element is a type of messaging app. You choose where your messages are stored, putting you in control of your data.
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Psi – cross-platform XMPP instant messaging client
Psi is an instant messaging application designed for the Jabber (XMPP) IM network. Chat using Google Talk, LiveJournal and many other groups.
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Signal – encrypted communications app
Signal Desktop is an app that lets you send or receive Signal messages using your laptop or desktop computer. It runs independently of a web browser.
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Gajim – full featured and easy to use XMPP client
Gajim is an open source Jabber client written in Python, with a GTK+ frontend.
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Sendmail – Mail Transport Agent
Sendmail is a Mail Transport Agent (MTA). It is suitable for handling sophisticated mail configurations, but this means that configuration can be complex.
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qmail – modern SMTP server
qmail is an Internet Mail Transfer Agent (MTA). It was written as a more secure replacement for the popular Sendmail program.
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chasquid – SMTP (email) server with a focus on simplicity
chasquid is an SMTP (email) server with a focus on simplicity, security, and ease of operation. chasquid is free and open source software.
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Citadel – groupware software
Citadel/UX (commonly known as Citadel) is an open source, complete and feature-rich collaboration suite (messaging and groupware).
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Dovecot – IMAP and POP3 email server
Dovecot is a mail server whose major goals are security and extreme reliability. It seeks to handle all error conditions and verify that all data is valid.
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