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Official Site | Second Life - Virtual Worlds, Virtual Reality, VR, Avatars, Free 3D Chat
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imo: free video calls and messages - official website
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Chat SDK and API: Voice, Video and Text Chat for Web & Mobile Apps - CometChat
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Official Site | Second Life - Virtual Worlds, Virtual Reality, VR, Avatars, Free 3D Chat
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MMO-Mumble - High-quality Mumble hosting for gamers
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WeChat - Free messaging and calling app
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Free Text Messaging - Send and Receive Free Text and Picture Messages - Sooeet.com