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Need a team chat application as a part of your collaboration tool suite? Here are four open source chat applications that will help your team stay connected.
Public key crypto for everyone, publicly auditable proofs of identity. Keybase is a new and free security app for mobile phones and computers. For the geeks among us: it's open source and powered by public-key cryptography. Keybase is for anyone. Imagine a Slack for the whole world, except end-to-end encrypted across all your devices. Or a Team Dropbox where the server can't leak your files or be hacked.
S. Fahl, M. Harbach, T. Muders, and M. Smith. Proceedings of the 23rd ACM conference on Hypertext and social media, page 145--154. New York, NY, USA, ACM, (2012)