The best alternatives to BROSIX are Slack, Telegram Messenger, and Sametab. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Collabe is a Team communication tool for modern teams loaded with all essentials features such as direct messaging, group messaging, file sharing, favourites & mentions, Notes. All at cost of ZERO dollar.
Threema is the world’s best-selling secure messenger and keeps your data out of the hands of hackers, corporations, and governments. Threema can be used completely anonymously, allows to make end-to-end encrypted voice and video calls, and offers every feature one would expect from a state-of-the-art instant messenger. With Threema Web, you can also use Threema from your Desktop.
A fast, standalone Telegram app that works without your phone! Send, receive, and see all your messages right from your wrist - even when you don’t have your phone around. Nanogram also supports FlickType Swipe Keyboard, for fast & private replies on the go.