Rocket.Chat
MIT-core team communication platform — E2EE, RBAC, and air-gapped deployments for regulated industries. Message auditing and HA require the paid Enterprise Edition.
Customer Support
Chatwoot
A mature, SOC 2-certified customer engagement platform and omnichannel dashboard. The open-source, sovereign alternative to Intercom and Zendesk.
Typebot
FSL-licensed conversational form and chatbot builder from TYPEBOT SAS (France, EU) — self-hostable on Docker with PostgreSQL; SSO and WhatsApp integration require paid tiers.
Zammad
AGPL-3.0 helpdesk with unlimited agents and tickets in the free self-hosted edition; LDAP and SAML ship standard, no enterprise paywall.