NexusTools is a collection of 39 free developer tools that run entirely in your browser. No sign-ups, no data collection, no uploads everything is processed client-side Tools include: JSON/SQL/YAML formatters, color converters, regex tester, JWT decoder/generator, password generator, QR codes, image compressor, CSS visual generators, LLM token counter, CIDR calculator, and more. Built with Next.js 15, TypeScript, and Tailwind CSS. Available in English, Spanish, and Portuguese. Open source (MIT)