Thanks, yes, all the lectures on GC algorithms (from Part 2 of the course) have a detailed source code implementation. This is done is pseudo-code though, explicitly showing that you can port this implementation to any language you'd like.

As mentioned below in this comments thread, GC algorithms are not only specific to objects in raw heap memory. These algorithms are transferrable to higher-level systems as well.

As to specific implementation, yes, I'm planning to have a GitHub repo with all the algorithms implemented in C++.