- 2020s: Linux, specialising in EL (Centos, RHEL, Rocky), Debian. MariaDb administration. Uyuni. Grafana. PRTG. Zabbix. Docker and the dozens of other stacks that sysadmins need to know.
- 2010s: Bash, Python
- 2000s: Perl, PHP, Bootstrap, SQL
- 1990s: TADS, Borland Turbo-C
- 1980s: BASIC, Quill, Adlan, GAC
- DIY, Home Automation, doing things with computers
- Walking, Geocaching
- Motorcycling with the occasional easy green lane