Slack

Business messaging and collaboration platform owned by Salesforce. Used through web, mobile and cloud services by consumers or businesses across multiple markets.

4 Alternatives Found

Element

United Kingdom

Secure, decentralized messaging based on the Matrix protocol

Key Features

End-to-end encryptionSelf-hostableBridges to other platformsVoice/video calls

FreemiumFree for individuals, business plans from $5/user/month

Website

Wire

Germany

Secure enterprise collaboration with end-to-end encryption

Key Features

Encrypted messagingVideo callsFile sharingGuest rooms

SubscriptionFrom €5.83/user/month

Website

Stackfield

Germany

German all-in-one collaboration platform with encryption

Key Features

Encrypted messagingTask managementDocument collaborationVideo calls

SubscriptionFrom €11/user/month

Website

Rocket.Chat

Brazil/Europe

Open-source team communication platform with self-hosting option, originally from Brazil with strong European presence

Key Features

Team messagingVideo callsFile sharingSelf-hosting

FreemiumFree community, Enterprise from $7/user/month

Website

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