Looking for open-source b2b ai coding and prototyping tools for my company

I work at a small enterprise company. Claude code not allowed and we have issues with running out of tokens with Github co-pilot. For prototyping we use VS code, our own design system agent + github copilot, but some product managers find it too technical. Loveable not allowed either (Corporate world!!!)

For our design systems I have been hearing of the framework called design tokens, anyone worked with them?

For everything else, I want to know if anyone knows of any fixed cost AI systems, maybe open source and if we hosted what would be the costs?

Appreciate anyones insights