Shown below is a CryENGINE3 Automation Frontend script for Blender 2.59 used by Sinsoft to evaluate the engine.
We have decided to evaluate CryENGINE3, and currently we are successful in getting Blender to export to Sandbox. However it involves multiple conversions of the collada .dae file that Blender produces ( --- the conversions are automated).
EDIT: We have found several issues when exporting to Blender (see below).
One is that the SDK doesn't come with sample DAE files in order for Blender users to post process the dae files to fit the engine requirements. For example User Defined Types (or UDP) are needed to specify physics properties. In CryENGINE3 physics properties like box, sphere, capsule, mass, etc have to be set in the DCC app and are specified in UDP types in the collada output. However we have no idea what the format is.
The second issue that arises is that CryENGINE3 requires long names for objects and materials which Blender does not support.
The script is not publicly available as it contains workflow operators specific to Sinsoft's workflow.
Screenshots: