Define popular. For example: No one really uses reactos in production and a significant number of hn commenters are disappointed its not a js framework. Yet I w

Define popular. For example: No one really uses reactos in production and a significant number of hn commenters are disappointed its not a js framework. Yet I would consider legitimate contributions there to be similarly interesting to contributions to any other OS (Linux, Minoca, BSD, etc). I'm fact, I suspect much of the work to be done for reactos is far more interesting than the work to be done on reactjs, despite the latter being leagues more popular.