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The XSI Add-On for Valve Source includes the very same XSI plug-ins used by Valve to create Half-Life 2, and other Source engine models and 3D artwork. Add-ons are a feature that let you add customizations to XSI, including layouts, toolbars, key maps, custom commands, and more. The XSI Mod Tool req...
This special version of Softimage|XSI allows you to create custom content for Half-Life 2 (characters, level props, etc). Detailed info can be found at the Softimage website. Be sure to grab the add-on as well.