Crystal - C++ implementation of a unified framework for multilingual TTS synthesis engine with SSML specification as interface.

Adversarial code review that breaks the self-review monoculture. Use when you want a genuinely critical review of recent changes, before merging a PR, or when you suspect Claude is being too agreeable about code quality. Forces perspective shifts through hostile reviewer personas that catch blind spots the author's mental model shares with the reviewer.

A static code analysis tool for Crystal

Use SQL as first-class Crystal methods

Ultimate Tennis Statistics and Tennis Crystal Ball - Tennis Big Data Analysis and Prediction

Selenium alternative for Crystal. Browser manipulation without the Java overhead.

A robust DSL for writing command line interfaces written in Crystal.