I do a lot of personal software development, both for fun and to extend my skills. Here are some of the ones I'm most proud of:
Loom, a Smalltalk-like
programming language.
(This blog post
gives a pretty good overview of the language and my thoughts behind it.)
Sic, yet another mediocre small Lisp dialect that emerged out of the realization that C++ variadic arguments were a lot like S-expressions. I gave a talk on it for the Ottawa C++ users group. I don't have a recording or slides online, but the the blog post it's based on is here.
Backpack Ruby and monolith, a toolchain for creating standalone binaries in mruby. This takes advantage of a) MRuby's ability to create self-contained executables and b) the fact that modern operating systems will safely ignore anything that's been appended to an executable.
Bitart Bot is a Mastodon bot that generates procedural integer art.
Several experimental Ruby gems:
ReLarn a cleaned-up fork of the classic Roguelike game ULarn.