Program that interfaces AutoHotKey and youtube-dl so that I can easily play or download things with shortcuts. Haven't played a youtube video from the actual website in years (don't tell anyone).

Program that lets me keep track of the last time I did something (brush teeth, exercise, vacuum the floors, etc), which motivates me to do these things more regularly.

Program to convert between various units of bits, mostly so that I could do a calculation regarding download speeds.

Program to run programs without a shell, so that I could run certain commands on startup (it was faster to implement than to find an existing solution) [1].

Library to dump various useful information out of a Pokemon ROM, so that I could play the game more efficiently [2].

Playing card library, so that I could simulate certain solitaire games and figure out the chances of winning [3].

Program to quickly parse and generate markdown files from source code comments, existing solutions being too complex or not working quite the way I wanted [4]. This one ended up being a real winner, because it let me stop worrying about presentation and get back to writing code/documentation.

There's this sort of multi-tool I've been working on for game development on Roblox (very niche) [5]. A high-level overview is that it uses scripting to streamline certain workflows that would otherwise be tedious, such as parsing proprietary file formats, interacting with web APIs, or assembling a project into a final product. It's a winner because it lets me make even more tools for myself.

[1]: https://github.com/Anaminus/nosh

[2]: https://github.com/Anaminus/pkm

[3]: https://github.com/Anaminus/cards

[4]: https://github.com/Anaminus/qdoc

[5]: https://github.com/Anaminus/rbxmk