This is the most specialized and powerful tool for quality control. It detects omissions, inconsistencies, formatting problems, and terminology errors. This program can be integrated into most CAT tools so that the errors are automatically tracked. The freelance version (only 3 languages supported) costs around £200. The professional (unlimited version) costs around £800.
Xbench is similar to QA Distiller, although it lacks some of the features. However, it is used extensively because it is free.