Execute multiple commands in parallel and display output with ncurses
Arduino and Silicon Laboratories Si4735 radio library
Handy LPT port pins manager (also support COM port via USB)
Simple DIY Analog Hardware Interface
Create fast bare-metal FPGA designs without Verilog or VHDL
Userspace ANT protocol stack for Linux (Forerunner 310XT and others)
Arduino open source PID motor control