All categoriesSee all trending →
Communication & Collaboration
Chat, video calling, email, helpdesk, and discussion forums.
Trending in Communication & Collaboration
Chatwoot
Chatwoot is an open-source helpdesk replacing Intercom and Zendesk with self-hosted omnichannel support across email, WhatsApp, and live chat.
38.8k+1.2kLinuxmacOSWindowstoday
MITHelpdesk & Support
Inbox Zero
Open-source AI email assistant to replace Fyxer and Lindy with self-hosted inbox triage, plain-English automation rules, and local privacy.
12.9k+493Webtoday
Mattermost
Mattermost is an open-source alternative to Slack and Teams that delivers secure team messaging, boards, and incident workflows with self-hosted control.
39.5k+251LinuxmacOS
Zulip
Zulip is an open-source team chat platform replacing Slack with organized topic-based threading, rich Markdown support, and self-hosted data control.
26.2k+166LinuxmacOS
46 tools found
Rocket.Chat
Rocket.Chat is an open-source Slack alternative providing self-hosted team messaging, custom TypeScript apps, and complete control over internal data.
46.4kLinuxmacOSWindowstoday
MITTeam Chat & Collaboration
Mattermost
Mattermost is an open-source alternative to Slack and Teams that delivers secure team messaging, boards, and incident workflows with self-hosted control.
39.5kLinuxmacOSWindowstoday
AGPL-3.0Team Chat & Collaboration
Chatwoot
Chatwoot is an open-source helpdesk replacing Intercom and Zendesk with self-hosted omnichannel support across email, WhatsApp, and live chat.
38.8kLinuxmacOSWindowstoday
MITHelpdesk & Support
Jitsi Meet
Jitsi Meet is a self-hosted alternative to Zoom with WebRTC in-browser video calls, end-to-end encryption, and complete infrastructure data sovereignty.
30.2kLinuxmacOSWindowstoday
Apache-2.0Video Conferencing
Hey
Hey is a decentralized social web client for Lens Protocol that replaces centralized microblogging on X with portable on-chain identities and open data.
29.4kWeb2mo ago
GPL-3.0Forums & Discussions
Zulip
Zulip is an open-source team chat platform replacing Slack with organized topic-based threading, rich Markdown support, and self-hosted data control.
26.2kLinuxmacOSWindows1d ago
Apache-2.0Team Chat & Collaboration
ES
PromotedEdgar Sipki
Go & gRPC engineer · founder of EasyP
Mentoring for backend developers. Consulting for startups.
Go, gRPC and Protobuf done right, LLM agents in production, and the hard parts of shipping a first product.
GogRPCProtobufLLM agents
sipki.online
Forem
Forem is an open-source community platform replacing Bettermode with self-hosted discussions, Markdown publishing, and zero member fees.
22.8kLinuxmacOSDockertoday
AGPL-3.0Forums & Discussions
UVdesk
UVdesk is an open-source ticketing system replacing Freshdesk with self-hosted Symfony architecture, multi-mailbox routing, and zero per-agent fees.
19.6kLinuxmacOSWindows27d ago
OSL-3.0Helpdesk & Support
Bluesky
Open-source microblogging client and AT Protocol network featuring custom domain handles, open firehose APIs, and user-selected feeds.
18.4ktoday
MITForums & Discussions
Apache Answer
Apache Answer replaces proprietary forums like vBulletin with a self-hosted, tag-based Q&A platform featuring accepted answers and plugin connectors.
15.7kDockerLinuxtoday
Apache-2.0Forums & Discussions
K-9 Mail
K-9 Mail is an open-source Android email client that replaces Microsoft Outlook with direct IMAP synchronization and zero cloud-proxy data logging.
14.2kandroidtoday
Apache-2.0Email Clients & Productivity
Thunderbird
Thunderbird is an open-source email client replacing Microsoft Outlook with unified inboxes, native CalDAV calendar sync, and zero subscription costs.
14.2kLinuxmacOSWindowstoday
Apache-2.0Email Clients & Productivity
Page 1 of 4