SIP3

WebRTC compatible Selective Forwarding Unit (SFU) that allows for multiuser video communication.

Real time collaboration (RTC) server.

Stack Overflow in a JAR. An enterprise-ready Q&A platform with full-text search, SAML, LDAP integration and social login support.

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.

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.

SMTP (email) server with a focus on simplicity, security, and ease of operation.