Forever grateful to FreeBSD as it was my first non-windows/mac distro that had installed on one of my own machines. I snagged a copy of FreeBSD 4 that was bundled in a book that they sold at BestBuy. I spent all of Christmas installing it on a old Packard Bell Pentium 1, several times if I recall correctly (disk partitioning was rough for a newbie). That one day set my path for the next ~15 years