NanUI UI Framework Stops Updating – Lessons for Open‑Source Sustainability

Open‑Source Dependency and Maintenance Challenges

Recent industry reports show that 96% of codebases contain open‑source software, with 76% of the code itself being open‑source, and 91% of repositories include components that have seen no developer activity in the past two years, suggesting many projects have lost maintainers.

A Tidelift survey found that 60% of open‑source maintainers describe themselves as unpaid hobbyists, and 44% are the sole contributors to their projects.

NanUI: An Open‑Source .NET UI Framework

NanUI is an open‑source .NET/.NET Core WinForms UI framework that lets developers build Windows desktop interfaces using HTML5, CSS3, JavaScript and popular front‑end frameworks such as React, Vue, Angular, or Blazor. It is built on Xilium.CefGlue, which embeds the Chromium Embedded Framework, and provides a JavaScript Bridge for communication between the browser and .NET.

After nine years of development, NanUI reached a near‑stable API and planned a 1.0 release under the new name “WinFormium”.

Project Audience and Funding

Licensed under MIT, NanUI has been adopted by companies like China Unicom, Baidu, and others, but it remains free and relies on small donations, generating only a few thousand dollars annually—far insufficient to sustain full‑time development.

Maintainer’s Dilemma

The sole maintainer, Lin Xuanchen, announced the project’s discontinuation after losing his job during the 2022 pandemic. He now works selling steel and treats coding as a hobby rather than a profession.

Although version 0.9.109 is stable and functional for production use, the planned 1.0 release has been delayed due to lack of time to write documentation and examples.

Users are encouraged to continue with the current version or seek help via the project’s QQ group.