
breadboardhub — Circuit Design Registry for Arduino, ESP32 & Raspberry Pi
Simulate, fork, and share circuit designs for Arduino, ESP32, Raspberry Pi, and other microcontrollers.
@locatornation · X
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Simulate, fork, and share circuit designs for Arduino, ESP32, Raspberry Pi, and other microcontrollers.
@locatornation · X

Free, accurate online calculators and practical guides for finance, math, health, construction, engineering, and everyday life.
@CoreToolLaxl · X
I'm building CoreToolLab, a free utility site with calculators for finance, health, education and everyday decisions. We're trying to make each tool genuinely useful rather than just another basic calculator.

Create and export Mermaid diagrams including flowcharts, ERDs, and sequence diagrams online.
ghosts_ · HN
I've been slowly adding some new free tools to Moxie Docs (partly for SEO, partly to illustrate some of our feature sets before any commitment) for some reason this mermaid editor one blew up on Google rankings so I figured I'd share in case people find it useful! We also have ADR, AGENTS.md, LLMs, and a few other free tools.