Day in and day out I have used computers for more than 15 years both professionally and personally. I have been installing, using and reprogramming different Operating Systems since the days of DOS. Here is a list of OS's and software I have experience and proficiency with.
.: Linux (Fedora, Redhat, Ubuntu, Debian, Mandrake)
.: UNIX (Solaris 2.6-10, IRIX 6.2->, openVMS, AIX, HP-UX)
.: MAC OS (5 - Snow Leopard)
.: Windows (3.11, 95, 98, 2000, ME, XP, Vista, Seven)
.: DOS (3.1 - 6.22)
.: Oracle
.: MySQL
.: MS Access
.: PostgreSQL
.: Netbackup
.: Commvault
.: Syncsort
.: Backup Express
.: Legato/EMC Networker
.: Wireshark
.: Veritas Cluster
.: SunMC
.: McAfee
.: Powerquest
.: eTrust
I have used and am proficient with dozens of other applications including apache, photoshop, Corel. mathematica, autocad and MUCH MUCH more