8051 for Arduino IDE C Package for all STC89C51 family
The 8051 Simulator for Students and Educators
A cooperative scheduler OS for the 8051 and its derivatives.
A z80n-targeted repack of SDCC Win64 snapshot
Serial Bootloader for Microchip, Atmel, NXP, TI, 8051 microcontrolers
Simulator of 8051 microcontrolers
A command-line programmer for Atmel USB microcontrollers
MCS-51 programmer for Linux
LED matrix rebirth
Support for Texas Instruments CC Debugger in Linux