I have just published a small project called [watchcode](https://github.com/bluenote10/watchcode). As an exception, it's not a Nim project, but it was written 100% with Nim in mind ;). I was never fully satisfied with other solutions for code watching/rerunning, so I had to give it a go and I'm quite happy with the result. Maybe it is useful for other Nim developers as well.
- watchcode: not written in Nim, but at least for Nim ;) bluenote
