BuddyTalk is a java based instant messanger, you can login with your gmail username and password to chat with your friends or to test the software you can login with the provided username and pass. BuddyTalk is based on smack and xmpp protocol.
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Windows Live Messenger Alternatives
Windows Live Messenger is described as 'With Live Messenger you can chat online instantly in real time with friends, family and colleagues. Its faster than e-mail, more discreet than a phone call' and is a very popular instant messenger in the social & communications category. There are more than 50 alternatives to Windows Live Messenger for a variety of platforms, including Windows, Android, Mac, iPhone and Linux apps. The best Windows Live Messenger alternative is Signal, which is both free and Open Source. Other great apps like Windows Live Messenger are Telegram, Element, Discord and Matrix.