Homeworld: Cataclysm was originally developed in 2000 as an expansion of Homeworld, but was released as a stand-alone game.
Though it uses the same engine as its predecessor, several changes were made such as: the ability to toggle time compression between normal speed and eight times faster; ship upgrades (improving armor and adding new abilities), Command Ships and Carriers are given the ability to add external modules for ship research and fleet support; fuel was completely eliminated from the game and finally the sensor display could be used to issue attack orders to units.
The game also introduced new notable 3D features such as moving parts and transforming ships.
The story focuses on the struggles of Kiith Somtaaw, a minor clan amongst the Kushan, as they unwittingly release a deadly menace known as The Beast on the galaxy and seek to contain it. The Turanic Raiders, Bentusi, and Imperialist and Republican Taiidan also appear.

Notes:
All performance and rendering issues have been fixed.
Resolution has been manually set to 1280x800.
If the game should not start because of that you can open the user.reg file in the games preferences folder, search for homeworld entries and then change the resolution (hex values).

Known Issues:
Multiplayer has not been tested - no issues detected as of yet.

Requirements:
Mac OS version: OS X 10.5.8
Min. Processor: Intel Core Solo
Min RAM: 512 MB
Video RAM: 64 MB
Harddisk space: 650 MB