Flexisip
Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.
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Akkoma
Federated microblogging server with Mastodon, GNU social, and ActivityPub compatibility.
Chirpy
Privacy-friendly and customizable Disqus (comment system) alternate.
Fluxer
A free and open source instant messaging and VoIP chat app built for friends, groups, and communities.
GlobaLeaks
Whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform.
GoToSocial
ActivityPub federated social network server implementing the Mastodon client API.
Habitat
Habitat is a free and open source self-hosted social platform for local communities