BillionMail
BillionMail gives you open-source MailServer, NewsLetter, Email Marketing — fully self-hosted, dev-friendly, and free from monthly fees. Join the discord: https://discord.gg/asfXzBUhZr
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Federated microblogging server with Mastodon, GNU social, and ActivityPub compatibility.
Betula
Single-user federated bookmark manager with Fediverse support and archives.
Chaskiq
Full featured live chat, help center and CRM as an alternative to Intercom & Drift, Crisp and others.
Chirpy
Privacy-friendly and customizable Disqus (comment system) alternate.
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.
Fluxer
A free and open source instant messaging and VoIP chat app built for friends, groups, and communities.