Drilldown: tool

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tool (39)

tool > url

: mattermost.com

or signal.org

Use the filters below to narrow your results.

Mattermost (1) · Signal Foundation (1)

end-to-end encrypted messaging from a nonprofit (1) · open-source Slack alternative with self-hosted free tier (1)

https (2)

free (2)

Free, no ads, no paid tiers. Run by the Signal Foundation, a US 501(c)(3) nonprofit funded by grants and donations; by charter it cannot be acquired. (1) · Professional $10/user/mo; Enterprise custom pricing (self-hosted free tier available) (1)

open (2)

cloud (1) · hybrid (1)

End-to-end encrypted 1:1 and group messaging, plus voice/video calls, built on the audited Signal Protocol (Double Ratchet + X3DH). ~40M monthly users. Registration requires a phone number; usernames (added 2024) let you start chats without sharing it. (1) · Self-hostable, MIT-licensed team chat closely modeled on Slack's channel-based UX -- includes a Slack export/import path to ease migration. Free self-hosted tier runs indefinitely with no per-seat licensing cost; paid tiers add SSO, compliance exports, and HIPAA/FedRAMP-aligned deployment options. (1)

None (1) · Fewer native integrations than Slack out of the box -- most third-party connections go through incoming/outgoing webhooks rather than a marketplace, so budget some setup time. Good fit for teams that want a near drop-in Slack replacement and value Go-based, ops-friendly self-hosting. (1)

None (1) · WhatsApp (uses the Signal protocol but is Meta-owned and harvests metadata) and Telegram (chats are not end-to-end encrypted by default, weaker crypto). (1)

Secure Messaging (1) · Team Collaboration (1)

Showing below up to 2 results in range #1 to #2.

M

Mattermost - open-source Slack alternative with self-hosted free tier

S

Signal - end-to-end encrypted messaging from a nonprofit

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