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
OP 
Open source social media scheduler with account specific drafts, calendar queues, encrypted provider credentials, API access, MCP support, and compact self hosting
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
PO 
Self hosted social media scheduler with team workflows, analytics, AI content tools, API access, and support for major publishing platforms
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
VI 
Self hosted team messenger with chat, meetings, files, task boards, permissions and desktop or mobile clients for private internal communication
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