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OpenTrashmail
Complete trashmail solution that exposes an SMTP server and has a web interface to manage received emails. Works with multiple and wildcard domains and is fully file based (no database needed). Includes RSS feeds and JSON API.
Synapse
Server for [Matrix](https://matrix.org/), an open standard for decentralized persistent communication.
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.
Apprise
Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc.
Conduit
A simple, fast, and reliable chat server powered by Matrix.
Continuwuity
Community-driven Matrix homeserver, the continuation of conduwuit focusing on user experience and new features (fork of Conduit).