Zulip is a group chat app. Its most distinctive characteristic is that messages are threaded by topic, helping you have long-running, organized conversations.
FreeOpen SourceMac OS XWindowsLinuxAndroidiPhoneBSDWebSelf-Hosted
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
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