A web app with a set of utilities for encoding, decoding, and generating (from a proprietary declarative schema) config export strings for the QoL Bar plugin for XIVLauncher for FFXIV.
I wanted a way to build the QoL Bar hotbars using a text editor instead of clicking around in game / without needing to relaunch the game after modifying %appdata%\XIVLauncher\pluginConfigs\QolBar.json.
It took way longer to build this than it would have taken to have just done it in game but at least now it's trivially extensible for when new jobs/emotes arrive and the bars need to be updated. Having a way to generate bars programatically is nice too.