Slack is a proprietary team collaboration platform offering channels, direct messaging, file sharing, and integrations. Widely used in corporate environments. Full details →

Switching from Slack to an open source alternative gives you data sovereignty, end-to-end encryption, and freedom from subscription costs. Open source messaging platforms can be self-hosted, meaning your team’s conversations stay on infrastructure you control. They also support open standards like the Matrix protocol, enabling federation and interoperability with other services without vendor lock-in.

Open Source Alternatives

Element is a free and open source messaging app built on the Matrix protocol. Offers end-to-end encryption, decentralized hosting, and team collaboration features.

AGPL-3.0