Element is a secure, decentralised messaging and collaboration app built on the open Matrix protocol. It is fully self-hostable and used by governments and public sector organisations across Europe, including the French and German governments.
European alternatives to Slack
Slack is a US-based team messaging and collaboration platform. Owned by Salesforce, all messages and files are stored on servers in the United States.
This page lists European alternatives from companies based in a member state of the European Union (EU) or the European Free Trade Association (EFTA).