chasquid
SMTP (email) server with a focus on simplicity, security, and ease of operation.
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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.
Mattermost
Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).
OTS
One-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser.
ntfy
Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.
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.