Build-time CSS-in-JS for Tailwind v4: a typed sz prop compiles to utility classes, with no runtime style engine. SSR-safe hydration, opt-in class-name mangling, Vite and webpack plugins.
The Stan Math Library is a C++ template library for automatic differentiation of any order using forward, reverse, and mixed modes. It includes a range of built-in functions for probabilistic modeling, linear algebra, and equation solving.