Z-80 Assembler (ZX Spectrum), x86 Assembler,
C, C++, JavaScript & SPAs (before Angular),
Atmel AVR (RISC), Arduino (https://github.com/adafruit/Adafruit-GFX-Library/pull/125),
C#, help with config and system improvements
blind friends for crappy screen readers, Web adjustments (ex. https://github.com/eltomjan/ETEhomeTools/blob/master/HTM_HTA/CT1txtXhr.hta, https://openuserjs.org/scripts/eltomjan/KDD, etc.).