The Flesh from Doctor Who...just saw some of those episodes last night

Almost forgot Gangers (looks like someone got there before me ), N-Forms, Cybermats, the Men In Black, Slabs and Smilers from the Doctor Who Universe,

dinocroc and supergator (realy low budget syfy movie)
the zombie vampires in i am legend
aliens (from the alien films) were aparently made by 'space jockies'
some crichton examples; the swarm from prey and the guy from terminal man

The dreadnought machines, the Reavers, Harvesters, and other Forge aliens/machines from Star Trek Voyager Elite Force
The Archeopendra and other Exomorphs from Star Trek Elite Force II

Benzoate Ostylezene Bicarbonate (BOB)
Dr. Cockroach
Ginormica (Susan - SuuuuUUUUUUUuuuuusan)

Those 2 lovely Pets KLICK


...and who knows how many other villains from TMNT came in contact with that Ooze stuff (which was made by Scientists).

The apes from Planet of the Apes

I'm shocked Godzilla wasn't in the first post, I'd like to add King Ghidora and Rodan to that list as well, Rodan's the namesake of several of my Bird of Preys.

Adding to the list:
Lex Luthor created that evil superman knockoff.
The "zombies" from 28 days later.
Akira.
Skynet & the Terminators etc

The list could have begun and ended with Godzilla though, KING of the monsters.