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1. slate

   A completely customizable framework for building rich text editors. (Currently in beta.)

   TypeScript 21.4k 2.4k

2. superstruct

   A simple and composable way to validate data in JavaScript (and TypeScript).

   TypeScript 5.1k 182

3. segmentio/metalsmith

   An extremely simple, pluggable static site generator.

   JavaScript 7.7k 661

4. segmentio/myth

   A CSS preprocessor that acts like a polyfill for future versions of the spec.

   JavaScript 4.4k 156