Assembler, C, C++ Objective-C, Visual Basic, (Scripting) PHP, Perl, Phyton, Bash, JavaScript, (database) MySQL, Sqlite, (HDL) CUPL, VHDL, and Verilog.
Atmel AVR, 8051, 6502, 8048, PIC, Intel x86, Mitsubishi 37700, FreeScale (8, 16, 32) bit MCUs, ARM, NXP LPC series
Oscilloscope, Logic Analyzer, Multimeter, Frequency counter, Waveform generator, JTAG Debugger, EMI measurements systems, Soldering iron, …
Read and draw analog and digital circuit schematics. Can use common board layout tools to create PCB, Eagle, OrCad etc.