Element provides end-to-end encrypted chat, voice, and video communication in a decentralized framework. It is developed by the original creators of Matrix (an open standard for secure communication) and was released in 2014. The platform allows organizations and users to self-host their own communication server or use hosted options, giving them full data control and interoperability with other Matrix-based servers. Element emphasizes “digital sovereignty”: it is designed to be vendor-neutral and federated so that different organizations can communicate securely across domains. In practice, Element offers features similar to Slack/Teams/Signal (team chat rooms, file sharing, group calls) but in a fully open, auditable system. It is used by many governments and enterprises for secure team collaboration and by individuals who want a privacy-focused messaging solution.
Stackfield
Stackfield is a German secure team collaboration platform with chat, tasks, files, and project boards, featuring end-to-end encryption and GDPR compliance.