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  • Element DesktopcommunicationActiveApache-2.02026-07-05Element / Matrix contributors — Desktop client for Matrix, the open, federated and end-to-end encrypted communication protocol adopted by governments and institutions across Europe as their sovereign alternative to proprietary messengers.
  • Jitsi MeetcommunicationActiveApache-2.02026-07-05Jitsi community — Self-hostable video conferencing that runs entirely in the browser — no accounts, no apps, no data silo. During the 2020 shift to remote work it proved that critical communication infrastructure can be free software.
  • MastodoncommunicationActiveAGPL-3.0-only2026-07-02Mastodon gGmbH — Decentralised social network server speaking the open ActivityPub protocol: thousands of independently run instances federate into one network no company can own or shut down. It became the flagship of the Fediverse and the practical alternative to centralised platforms.
  • Mozilla ThunderbirdcommunicationActiveMPL-2.02026-07-02MZLA Technologies / Mozilla Foundation — Free desktop email client from the Mozilla family with calendaring, contacts, chat and strong OpenPGP encryption built in. Revived by community donations after years of neglect, it is proof that users will directly fund software that respects them.
  • MumblecommunicationActiveBSD-3-Clause2026-07-05Mumble developers — Low-latency voice chat server and client built for gaming and group coordination, with positional audio and strong encryption — self-hosted voice communication that predates and outlasts proprietary alternatives.
  • PidgincommunicationActiveGPL-2.0-or-later2026-07-05Pidgin / libpurple developers — Multi-protocol instant messaging client that connected AIM, ICQ, MSN, Yahoo, XMPP and more in one window. Its libpurple library and plugin architecture preserved interoperability through two decades of dying chat networks.
  • Signal DesktopcommunicationActiveAGPL-3.0-only2026-07-02Signal Foundation — Desktop client for the Signal messenger, whose end-to-end encryption protocol became the gold standard adopted even by proprietary competitors. Developed by the non-profit Signal Foundation with fully published source code.