FramesX is a large Figma UI kit and design handbook by designer BuninUX: 6,000+ auto-layout-ready components across 34 categories, plus 500+ predesigned blocks and templates, with a paired web-component library for design-to-code handoff.
The design handbook alongside the components is a genuine extra: it documents the reasoning behind the system, not merely the components themselves, which most UI kits skip.
Good for teams that want one large, cohesive system to standardize on rather than assembling several smaller kits.
It's sold directly by its solo creator (via Lemon Squeezy/Gumroad rather than a big marketplace), so support and update pace depend on one person rather than a company.