Group messaging platform owned by Microsoft. It's absolutely free, whether you're talking to a group of friends, or texting with one person. Best of all, it works on nearly every phone, via push or SMS.
Free PersonalAndroidiPhoneWebAndroid WearBlackberryWindows PhoneWindows Mobile
Peerio integrates cloud storage with a messaging platform so you can safely keep your important files online and ready to send from anywhere. With end-to-end encryption, messages and files are encrypted.
FreeOpen SourceMac OS XWindowsLinuxAndroidiPhoneChrome OSChrome
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