We have a list for 6mm, looking at what's available rule wise there's room for both multi and single based 15mm. But where to find it?
15mm co UKSeveral different rules and at least two lines of models.
Brigade ModelsA broad range of vehicles.
Ground Zero GamesThe mother of them all.
Irregular MiniaturesVarious marines and aliens and vehicles.
Kerr & KingNo actual Sci-F, but lots of nice bases for 15mm.
Old CrowHammer's Slammers and more. Recessed individual bases for 15mm (and 25mm).
Rebel MinisSome vehicles and Grey's. Lots of zombies...
Force XXI MiniaturesVehicles (grav, GEV, tracked, wheeled) -- kind of blocky and basic, but a decent variety.
Combat WombatVehicles (grav, GEV, tracked, wheeled) -- nice futuristic designs
Spriggan Miniatures (also available from
Rattlehead Games)
Spugs infantry -- nice mantis-ish alien infantry
The Scene UK15mm Space Orks, Space Troopers, and terrain accessories
Shield Wall GamesSome alien AFVs, turrets, accessories.  Also some customer service issues, so
caveat emptor...
ZombiesmithAphids!  Cute little 15mm frog-bug-troops at a great price.
LKM Direct/QRF/Freikorp15Vehicles (mostly tracked) and infantry, including excellent Giger-style aliens
Eureka MiniaturesIn addition to carrying GZG and a whole slew of historicals, Eureka has some really cool sci-fi/Weird War German troops
Peter PigVac-suited infantry, Phug aliens, and some vehicles
RAFMSome of the old Traveller Tanks, Vehicles, and Troops. A return of some oldies but goodies.
DLD ProductionsGreat near future Armored Vehicles.
BattlestationsSmall line of 15mm figures with some interesting alien races.
Kremline MiniaturesA small but interesting line of troops and Power Armor.
Stan Johansen MiniaturesVarious Troops and vehicles that include a great set of Space Dinos with Guns.
Team FrogThe people who brought you Critter Commandos has put out a coule of 15mm scale sets including a frog set.
Good! I got two commando sets when starting work on Frynt. Never knew from where they came. /ErikEM4Make some mech's (also very interesting plastic 28mm's).
Add your own to be added.
Perhaps also a pinning?