Dovel
SMTP server that sends and receives emails according to a simple configuration file, with an optional web interface that you can use to browse your emails.
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Answer
Knowledge-based community software. You can use it to quickly build your Q&A community for product technical support, customer support, user communication, and more.
AnyCable
Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.
Artalk
Comment system built in Golang, providing a lightweight and highly customizable solution for adding comments to your website.
Betula
Single-user federated bookmark manager with Fediverse support and archives.
BigBlueButton
Supports real-time sharing of audio, video, slides (with whiteboard controls), chat, and the screen. Instructors can engage remote students with polling, emojis, and breakout rooms.
Centrifugo
Language-agnostic real-time messaging (Websocket or SockJS) server.