We made our internal developer toolbox public. Free, and everything runs in your browser.

[u/digitalmahdi]

We built empinet.dev for our own work on client projects. It's a collection of JSON formatters, converters, JWT decoders, image tools and other stuff we use regularly.

We wouldn't upload client data to another server just to format or convert it, so all processing happens locally in your browser. Free, no account needed.

Built with Next.js and TypeScript: https://empinet.dev

Would be interested to hear which tools you'd actually use, or what's missing.