I have been meaning to work some on being able to use Nim with ANTLR for parsing for awhile now, but haven't had the time to sit down and spend any time on it yet. I saw that there are a few BountySource users on here, so I thought I would give that a shot (I haven't used BountySource before).
Here's the link to the bounty: https://www.bountysource.com/issues/32205478-implement-nim-antlr-3-binding It is for US$100.
For anyone remotely familiar with c2nim and ANTLR (and with some spare time!), I think that getting a basic integration going should be straightforward. Of course, I've been telling myself that for awhile and still haven't managed to sit down and do it so YMMV.
Note that this would be something that would be released under an Apache license, so the community should benefit from this as well.
Thank you for the bounty!
Just thought I would let everyone know that our Github issues have a bounty label. So if you're looking for issues with bounties attached to them you can easily get a list of all of them at https://github.com/nim-lang/Nim/labels/bounty :)