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Re:Slack raises $200M at $3.8B valuation for business messaging by squidlogic on Friday April 01, 2016 @08:42PM (#11409621)
Try Balboa. End to end encrypted. Has video calls too. Also has faster file transfer speed.

Targeted towards international NGOs operating in rough areas, but works for other business too.

Not free though. Seems security comes at a premium.

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