1996 PC (Windows95, just public access)
1998 TI Calc (Got interested in its Basic)
2003 VAX at university, PC (Windows XP, with full access)
2006 Debian at university
2007 Ubuntu till now. Still trying some other distributions from time to time.
At work, company endorsed some systems:
2008-2012 OpenBSD server (Replaced later with FreeBSD, ~2014)
Adding my 2nd answer here; Because the community really deserves (every single one of you) the thank you - post I did above;
My first experience with Linux, was...
No but - enough with the jokes; It was Ubuntu, my friend introduced me to it as I begun more and more show interest in programming and , especially computer security. And as I grew ...