Currently occupying the list in http://www.reddit.com/r/LightWeightMarkup/wiki/commonmark/implementations with current implementations in the field.
Just wondering if I missed anything. Btw, you can edit it directly if you are subscribed to the subreddit for now.
So far I noticed:
Remarkable - high speed pluggable implementation for javascript
AngularJS Markdown using CommonMark
http://hypercubed.github.io/angular-commonmark/#/api
If you do a search for CommonMark on GitHub, you will find both PHP and Python implementations and other ports as well.
CommonMark.NET
Optimized for speed, updated to version 2 of the specification.
https://www.nuget.org/packages/CommonMark.NET/
https://github.com/Knagis/CommonMark.NET
CommonMarkSharp
Optimized for extensibility, version 1 of the specification.
kk, page updated. Thanks. Didn’t cover all implementations, just the popular links. Will update it more as more development occur. Oh and if you can, don’t forget to subscribe or post any updates about your work on that subreddit as well.