Until recently, the only code I’ve released as open source has been the Magma MUD codebase.
In the process of posting the Magma source on Github, I kind of got hooked on posting code online. Since then I’ve posted the source for a handful of applications, a mix of Linux and Windows desktop apps. A 12-day commit streak so far, yay!
I’m also considering open-sourcing the Basternae 3 codebase. The main things that make it easier to work with than old-timey C-based MUDs are the use of C#, which has amazing exception handling and debugging capabilities (no more attaching gdb to a core dump), and speaks XML natively, so data files are Human-readable, portable, fairly robust, and extensible. The editor is also getting to be pretty good.
To open source Bast3, I’d need to write a lot more documentation, and I’d need to “genericize” a lot of things that are specific to Basternae. It’d be a lot of work, but I think it’d be a fun project. The source is already in a private repository on Github, but that’s the easy part.