Chinese companies have very little presence online and many people may believe that Chinese are reluctant to engage in open source projects.

Last year, @filmaj used the GitHub REST API to pull public profile information from all 2,060,011 GitHub users who were active in 2017 (10+ commits to public projects) yields this ranking of the top-30 corporate open source contributors, the result is like

So Alibaba ranked at #9 and Tencent ranked at #12. Not bad.

I also did some research, Reposted from my comment on Hacker News, the following is the list of open source projects which has Chinese companies as active supportors.

• Free software Foundation patrons
• Linux Foundation. If you frequent Kernel lists you can find many Chinese contributors (from Redhat, Huawei, etc.)
• Eclipse Foundation
• Apache Foundation, and many Apache projects like Apache Dubbo
• OpenSSL exceptional support. Smartisian is a mobile phone vendor which donates their release event tickets to OpenSSL back when the HEARTBLEED security bug was a great threat.
• Ceph Foundation
• OpenContainers Initiative
• CNCF members
• OpenStack foundation
• Xen members
• RISC-V Foundation
• OpenPOWER members

Notable Open Source projects started by Chinese:

• vuejs, popular javascript framework comparable to ReactJS.
• OpenResty, full-fledged scriptable nginx with LuaJIT2
• LVS: The Linux Virtual Server Project
• TiDB, TiKV: Distributed Transactional Database with MySQL-compatible protocol.
• ECharts: A powerful, interactive charting and visualization library for browser
• Dragonfly: P2P Container Image Distribution
• Harbor: Container Image Storage

This list is incomplete, I hope one day there will be a Chinese company out reach even more open source communities like Redhat. If I have some projects missing please leave a comment!