Lospec Insertinator is a plugin that allows you to insert Palettes from Lospec as a group of baseparts. Simply typing in the Slug (ID of the palette in Lospec words) and you’ll get a tower of multiple baseparts colored after that palette.
The purpose of GitHub is to upload raw code files for browsing and contributions. In your case, it would be uploading the raw .lua files. You can publish your .rbxmx to GitHub Releases.
Here’s one of my old plugins on GitHub for reference (with Releases):
This is mostly a personal tool that i’m freely releasing for anyone to use or build upon (Which is primairly why i uploaded it under WTFPL), and while those features would be nice, i’m generally comfortable with the workflow of it which is to just insert palettes as baseparts and copying the color (or the name) then manually putting it in whatever i wish. It’s generally just a personal tool i’m offering for anyone to take and do anything with