I mostly know about software relevant for game development, and there are indeed some very interesting products (most of them open source) coming out of China which are mostly unknown in the West. Some examples from my list:

- FairyGUI (UI framework for games): https://en.fairygui.com/index.html, github: https://github.com/fairygui

- LayaAir (HTML5 game engine): https://github.com/layabox/LayaAir

- Egret (HTML5 game engine): https://github.com/egret-labs/egret-core

- Cocos2D-X (2D game engine, this might be the only one that's also really popular outside China): https://www.cocos.com/en/

- everything by Cloudwu (but especially pbc, protocol buffers in C): https://github.com/cloudwu