Matrix client for federated, E2EE-capable real-time communication.
chatmatrixfederatione2ee
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11 tools match your filters
Also strong
Team chat platform with channels, threads, video, and broad integration marketplace.
chatteamself-hosted
Also strong
Thread-first team chat combining email-like topics with real-time messaging.
chatthreadsself-hosted
Honorable mention
Messenger using email as transport—chat over your existing IMAP/SMTP accounts.
chatemailprivacydecentralized
Honorable mention
Early open chat models fine-tuned from Llama-class bases by LMSYS—widely mirrored on the Hub (e.g. Vicuna-7B v1.5).
llmhuggingfacechatinstruction-tuninglmsys
Also strong
Open-source Svelte/TypeScript app that powers HuggingChat—multi-model chat, tools, and self-hostable UI patterns.
chatuillmself-hostedtaaft-repositories
Open standard for decentralized, encrypted real-time communication; reference server Synapse.
federationchate2ee
Also strong
Customer engagement suite: chat, email, and campaigns (Intercom/Zendesk class).
helpdeskchatcrm
Honorable mention
E2E-encrypted team chat, calls, and file sharing.
chate2eeteams
Honorable mention
Real-time XMPP server for chat and presence.
xmppchatserver
Honorable mention
Multi-protocol chat client with libpurple plugins for XMPP, IRC, and various legacy networks.
chatxmppirclibpurple