Hors Europe
Alternatives à Slack
Slack is a messaging app for business that connects people to the information they need, bringing people together to work as one unified team.
Alternatives européennes6
Fleep
EstoniaEstonian team messenger that combines chat with email bridging, conversation tasks, pinboards, file sharing, and Business admin ownership of accounts and history.
ginlo Business
GermanyGerman-hosted secure business messenger from Munich-based ginlo.net GmbH: E2EE chat, files, and A/V calls with Management Cockpit admin for AD/LDAP, policies, and external ginlo Private contacts.
Nozbe
PolandPolish task and project management SaaS with task-based communication, multi-workspace separation, offline apps, and vendor-hosted EU primary infrastructure.
Private Discuss
FranceFrench secure collaboration suite from Limonest (Lyon area): E2EE video, webinars, messaging, co-editing, and admin controls for government and sensitive organisations, with SaaS or on-premise deployment.
Stackfield
GermanyGerman all-in-one collaboration suite (chat, tasks/projects, video, docs) with optional client-side end-to-end encryption and Germany-hosted cloud or commercial on-premise.
Wire
SwitzerlandSwiss open-source secure messenger from Wire Swiss GmbH: always-on E2EE messaging, calls, and files (MLS), cloud or on-premises, for regulated teams and public sector.