Perl, C (and features of gnuc), C++, lex, yacc, bash, PHP, Javascript, SQL, Assembler, python, TeX. Linux: cgi, fastcgi, iptables, daemons, XLib, gtk, mpi, pthreads. Network protocols: programming multicast rtp at a level udp and ethernet. Creation of algorithms and programs on processing images, video and sound. Changes for software: Mplayer, Mozilla/Firefox, Knoppix, Gajim. AJAX, Embedded Linux. Creation of a Linux router on one diskette. Development of programs for digital videocameras.