Vichan was the most widely used software for western imageboards for at least around 8 years. It's predecessors are all dead.

Lynxchan, its main rival is also long dead. https://github.com/skyssolutions/lynxchan

https://gitgud.io/fatchan/jschan Jschan is unmaintained. It was popular during the explosion of tiny, short lived western boards during covid.

As far as I can find, the only western imageboard software that is actively maintained and open for public use is Kokonotsuba.

Will more people migrate to kokonotsuba now that Vichan is officially dead?