Try mo hanapin dito, pero I highly recommend or suggest bilhin mo nlg, nag sa-sale din naman sya para support nadin, ganun din kasi ginawa ko eh binili ko nung nag sale hehe.
Pero if ever alaws talaga, try mo explore dito marami yun dito...
Mura na lang yang mga old HL/HL2 games at mas madaling maglaro direct thru Steam. Pero kung gusto mo ng libre for whatever purpose, just try at your own risk the rips/repacks on sites like dodi-repacks.site or ovagames.com, atbp. Norm naman yan noon pa.