No, honestly. He contributes little bugfix patches to projects here and there to various projects, but he doesn't want to maintain software for anyone else (fair, I think -- he did spend an entire career doing that).

He makes (pretty cool) side-scrollers for this grandchildren, tools for himself. He sometimes complains that he's not sure what to build, but he figures it out. He also has a Mac and a Linux box (running Gentoo, I think). That keeps him busy!