There have been so many manufactures making Star Wars products, but there only been two companies licenced to make gaming miniatures.
In the 1980s Grenadier started to produced box sets and blister packs of Star Wars 25mm miniatures to support West End Games Stars Wars role-playing game and later in the 1991 Star Wars Miniatures Battles.
Wizards of the Coast produced a small range of 28mm miniatures for thier edition of the Star Wars role-playing game, but in 2004 they published a collectible miniatures games called Star Wars Miniatures which was supported a range of 28mm pre-painted plastic miniatures which also was designed to be used with their Star Wars role-playing games and in 2006 they published Star Wars Miniatures Starship Battles with a range of pre-painted collectible space ships.
Grenadier Star Wars miniatures list on The Stuff of Legends website