BI 
Open source virtual classroom platform built for online education. Audio, video, screen sharing, shared whiteboards, polls, breakout rooms, and a recording system designed around the needs of instructors and students
Communication & Support
Video conferencing, team chat, and customer support platforms.
CH 
Open-source customer support platform with a shared inbox across email, live chat, WhatsApp, Facebook, Twitter, and more. Self-hosted alternative to Intercom and Zendesk with a clean agent UI
DI 
The most widely deployed open-source community forum, used by 22,000+ communities. Includes real-time chat, knowledge base, and a plugin ecosystem. Self-host free
FH 
Open source customer support platform built on the Frappe framework. Ticket management, SLA tracking, automation rules, a customer portal, and a clean agent interface — all self-hostable and free for teams that do not want to pay Zendesk's per-agent fees
FR 
Self-hosted shared inbox and help desk built with PHP/Laravel. A close open source replica of Help Scout — conversation threads, collision detection, saved replies, and a module system — without the per-agent subscription cost
GA 
Lightweight Go video conferencing server designed for low resource use. A single binary, no external dependencies, and straightforward deployment — built for universities, small teams, and anyone who wants a self-hosted video platform without Jitsi's operational weight
JA 
General-purpose WebRTC server and gateway by Meetecho. A plugin-based C library that powers custom real-time applications — video rooms, SIP gateways, streaming, and data channels — rather than a ready-to-use conferencing product
JM 
Open-source video conferencing platform with no account required and no time limits. Self-host for private meetings or use meet.jit.si for quick calls
JV 
WebRTC Selective Forwarding Unit (SFU) that routes multi-party video streams without decoding them. The media routing core behind Jitsi Meet — deployable standalone to power custom video conferencing infrastructure
LI 
Self-hosted customer support desk with live chat, email, SLA management, and SSO built in. Free, open source, ships as a single Go binary
MI 
Mail In A Box turns a fresh Ubuntu VPS into a complete email server with one script. Installs Postfix, Dovecot, Roundcube, Nextcloud contacts and calendar, and auto-configures all DNS records
MA 
Self-hosted email suite bundling Postfix, Dovecot, Rspamd, SOGo, and ClamAV in a single Docker Compose stack. Full web UI for domain and mailbox management
MA 
Self-hosted mail server as a Docker Compose stack with SMTP, IMAP, anti-spam, anti-virus, admin UI, and webmail included. MIT-licensed and free
MA 
Self-hosted ActivityPub microblogging platform. Run your own Twitter-style community that federates with the fediverse. AGPL-licensed, Ruby on Rails, free to self-host
MS 
Federated, end-to-end encrypted messaging server implementing the Matrix protocol. Run your own chat homeserver that interoperates with the wider Matrix network
MA 
Self-hosted team messaging with channels, threads, and search. Free Team Edition for unlimited users, with enterprise features for larger organisations
MC 
Self-hosted cam-to-cam video calling designed for iframe embedding. Two-participant only, end-to-end encrypted, with screen sharing. Built to drop into any website as a lightweight video widget
MP 
Self-hosted WebRTC video conferencing with direct peer-to-peer connections. Minimal server load, no time limits, and up to 8K at 60fps. Best suited for small groups and 1-to-1 calls
MS 
Self-hosted WebRTC video conferencing using a Selective Forwarding Unit for scalable multi-participant calls. Supports recording, RTMP streaming, AI integrations, and up to 8K at 60fps
OT 
Open source web-based ticketing and ITSM platform. Community successor to OTRS after it went commercial — handles email-based support queues, SLAs, escalations, and ITIL-aligned service management for help desks and IT teams
OU 
Self-hosted team knowledge base with real-time collaborative editing, AI-powered search, Slack integration, and clean Markdown support. Open-source, Docker-deployable
PI 
Decentralized photo sharing platform federated via ActivityPub. Instagram-inspired, no algorithms, chronological feed, self-hosted on PHP and Docker. AGPL-licensed
PL 
Self-hosted video conferencing platform built on LiveKit and WebRTC. Provides a full-featured meeting UI with breakout rooms, polls, shared whiteboards, recording, and an API for embedding into your own applications
PO 
Self-hosted transactional email delivery platform with SMTP, delivery analytics, bounce handling, and click tracking. MIT-licensed alternative to Sendgrid and Mailgun
RT 
Battle-tested open-source ticketing system with 20+ years of production use. Email-driven queues, custom workflows, SLA management, asset tracking, and 400+ free extensions. Written in Perl
RO 
Self-hosted team messaging with channels, voice and video calls, file sharing, and cross-workspace federation. The most full-featured open-source Slack alternative
SM 
All-in-one mail server in Rust with IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV support plus built-in anti-spam. Replace five services with one binary
WR 
Minimalist fediverse-connected blogging platform that publishes via ActivityPub. Single or multi-user, written in Go, runs on a small VPS. AGPL-licensed and free
ZA 
Open-source helpdesk and customer support ticketing system with multi-channel inbox, SLA management, and knowledge base. Self-host your support operation without per-agent subscription fees