Inherit The Earth: Quest For The Orb is still being sold, namely
here
HOTU has the cd-rip version of Alien Virus (downloading it at the moment), Back To Baghdad, Battles In Time, Deadly Racer and Abandoned Places.
According to HOTU, is In Search Of Dr. Riptide shareware, not abandonware (but they have it)
The games on that list that're still lacking information 'bout their availability are Colony 28, Island of the Dead and D (which's one hell of a hard one to even search for)