Our great sponsors
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Conversations
Discontinued Conversations is an open source XMPP/Jabber client for Android [Moved to: https://github.com/iNPUTmice/Conversations] (by siacs)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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ChatSecure-iOS
ChatSecure is a free and open source encrypted chat client for iOS that supports OTR and OMEMO encryption over XMPP.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Android: Conversations [it can be routed through Tor]
RetroShare, for desktop (though only add people you trust)
For file sharing: OnionShare
Mac: Psi, Adium, Monal (though it's in beta phase at the time of writing and unfortunately and they have odd stances on GDPR (source))
iOS: ChatSecure [No Tor connection? That I don't know.]