PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
Modbus slave simulator
A software gps simulator
Both a DHCP client simulator and a DHCP attack tool.
A library that allows programs for a NI CRIO to be run on a computer.
Protocl forge is a protocol simulator
PunyKit - it's a very simple webkit-based browser.
EFT simulator