StarTalk is an open source IM system platform. It covers all the target platforms and target systems you can think of. And excellent performance.
Visit for details: https://github.com/startalkIM/Startalk/blob/master/README-cn.md
StarTalk PC is a PC client based on the StarTalk open source service. It supports Windows, Linux, and Mac platforms, and the UI and features are the same across all platforms except for some differences in the nature of the platforms.
Home Page: https://i.startalk.im/home/#/
Release Download: https://i.startalk.im/home/#/download
Build Instructions: https://github.com/startalkIM/startalk_pc/wiki/Install-Instructions