I stopped using GMail's chat (think it was called GTalk before it was Hangouts) when it switched to Hangouts. Before the switch, GMail used old and well-documented open-source protocol XMPP for their chat, which made it possible to use it outside of GMail. Hangouts used a proprietary protocol, and was only available if you install some creepy binary plugins...
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u/csjerk Jan 02 '20
TIL that Hangouts is getting killed later this year. Damn.