Poste.io
Full-featured solution for your Email server. Native implementation of last anti-SPAM methods, webmail and easy administration included. Free tier available.
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Full-featured PABX system, with call queues, built-in web conferencing, live chat and social media messaging all on one system.
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Online whiteboard, audio/video conferencing, screen sharing, shared code editing and optional session recording/playback.
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Federated microblogging server with Mastodon, GNU social, and ActivityPub compatibility.
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Email forwarding service for creating aliases.
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.