Bluespec Compiler (BSC)
Scala based HDL
Allows you to create machine-readable definitions of asynchronous APIs
PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
Gerber to PDF converter
Yet another collection of WindowsXP ServicePack3 x86 binaries.
Real Time Electronic Circuit Simulator.
Rocket Chip Generator
AVR simulator IDE
Open source process design kit for usage with SkyWater Technology
Python Gerber to G-code converter
Electronic design and programming tools suite like Eagle, MpLab