Computing languages: C, Tcl/tk, Lisp/Scheme, Prolog, assembler of several microprocessors (Intel 80X86, 8X51, Microchip's PIC, and others).
Compiler-compiler and other tools: Yacc, Lex, sed, unix shell.
Hardware design languages: VHDL and several proprietary (AHDL, PALASM, etc).
Other languages: html, including css, cgi scripting, perl, TeX/LaTeX, postscript.