I used to work as a translator and found a little-known CAT-tool which is quite cheap but very comfortable to work with. It's called MetaTexis and unfortunately it works on Windows only as an addition to MS Word. So, if you're a translator and work with MS Word I strongly recommend that you check it out, it has a fully-functional free demo version.

Computer Assisted Translation (CAT) tools are productivity tools to automate some aspects of the translation process. Over the past few years, CAT tools have developed rapidly, dramatically increasing translation efficiency.