A collection of 25+ essential developer and productivity utilities. Includes JSON formatter, JWT decoder, Base64 converter, LLM token counter, case converter, word counter, currency converter, loan calculator, password generator, UUID generator, Unix timestamp converter, Mermaid diagram viewer, and more. All tools run entirely client-side for privacy. Built with Astro 5 + Tailwind CSS + TypeScript. Docker-ready, deployed at cybertools.dev.