In brief:

ThinkFree Office is produced by Haansoft ThinkFree Co. Ltd., a subsidiary company of Haansoft Corporation. Office suites from this vendor previously bore the names Hancom Office or Haansoft Office.

ThinkFree is a commercial application; the Linux version currently (2010) retails at €40. A 30-day free trial version is available. In the past, this vendor has claimed 60% of the Korean office suite market.

ThinkFree website