Sadly, I have searched for a list of all the movies SciFi has shown, and yet, cannot find any comprehensive list.
Based on the more prolific ones, here's what I remember.
Cabin by the Lake
Return to Cabin by the Lake
Dagon
Dog Soldiers
Neon Maniacs
Moonbase
Project: Metalbeast
Komodo
Deadly Invasion: The Killer Bee Nightmare
Marabunta
Alligator
Alligator 2: The Mutation
Android
Mr. Stitch
Saturn 3
Videodrome
Fright Night
Fright Night Part 2
Never Cry Werewolf
The Frighteners
Night of the Creeps
Blade Runner
Steel Justice
Runaway
Meteor Man
The Specials
Shriek if you know what I did last Friday the 13th
The Shadow
Interceptor Force
The Last Starfighter
Hide and Creep
Deadly Virus
Flying Virus
Spiders
Spiders 2
Snakehead Terror
Bug Buster
Crocodile
Crocodile 2
Blood Surf
Army Of Darkness
Boa
Python
Boa vs. Python
Godzilla vs. The Smog Monster
Destroy All Monsters
Godzilla, Mothra, King Ghidorah: Giant Monsters all out Attack
Godzilla vs. Megaguirus
"Roswell" movie
Alien Cargo
Alien Apocalypse
Alien Invasion
Alien Avengers
Alien Lockdown
Alien Predators (Yes, Alien Predators)
Alien Express
Decoys
Decoys 2
Species Series
Pumpkinhead Series
Megasnake
Basilisk
Hackers
Cyborg
Cyborg 2
Cube
Cube 2: Hypercube
Watchers 2
Watchers 3
Watchers Reborn
Dark Ride
The Gravedancers
Unrest
Penny Dreadful
Xtro 3
The Unborn
Brain Dead (Twilight Zone writers movie, not Jackson)
Dracula 3000
Mammoth
The Fallen Ones
Raptor Island
Sabretooth
Attack of the Sabretooth
Hammerhead: Shark Frenzy
Shark Hunter
Swamp thing
Man Thing
Carnosaur series (Including Raptor)
Slipstream
Aberration
Leprechaun series
The Shaft
The Apocalypse
Killdozer
Maximum Overdrive
Trucks
The Langoliers
It
Pet Sematary 2
Village of the Damned
Mosquito
Skeeter
Lawnmower Man
Lawnmower Man 2
