Deadline is a very obscure tactical strategy game in the same vein as X-COM, except with a much more confusing interface.

Emergency: Fighters for Life is a unique and fun "light" strategy game from TopWare that got far too little shelf life than it deserved.

Enemy Infestation is an interesting and enjoyable squad-based RTS.

Fallen Haven is a noble attempt by I-Magic to attract non-strategy gamers who are interested in the turn-based strategy genre but found X-COM too daunting.

Front Mission is a superb turn-based strategy game for SNES platform by Squaresoft (now Square Enix) that unfortunately was never released outside Japan.

A fun isometric squad-level strategy game à la X-COM but with a unique premise, Gender Wars was unfortunately largely neglected when it was first released.

A great PC version of the equally underrated board game of the same name from Games Workshop, Hero Quest is an isometric tabletop strategy/RPG game that simplifies RPG statistics without...

Incubation is one of the best X-COM-style games ever made - and in my opinion superior to MicroProse' much better-known X-COM: Apocalypse.

One of the most addictive games ever made in any genre, Jagged Alliance is a great strategy game that successfully combines the outstanding squad-level gameplay of X-COM with an unprecedented...

Released after Jagged Alliance, Deadly Games is more appropriately called a "stand-alone add-on" rather than a true sequel to that classic (similar to X-COM 2).