A Next.js catalogue of AI models and tools with playful interactive widgets — quit, battle, roulette, an ROI calculator, and a stack builder. The word "playground" is the right one: it has more personality than most directory sites, and the tooling beneath it is serious (Vitest unit tests, Playwright e2e, full i18n). It reads as a marketing asset that doubles as a demo of what you can build. The next step would be turning the catalogue data into something genuinely dynamic — feeds or ratings — so it stops being beautiful static content.