In Banjo-Kazooie's case, the 3D platformer's decompilation project has been in the works for quite some time. If you scroll through the GitLab page's history, you can see that it was first made in ...

It's taken years, but Banjo-Kazooie fans have finally finished decompiling the code of Rare's classic 3D platformer, paving the way for new community experiences. News.