QA Distiller is a useful translation QA tool that lets you run a series of tests on various types of bilingual files, including Xliff (SDL Trados Studio and MemoQ), ttx (Tag Editor), and TMX.
QA Distiller offers a wider range of QA checks than Xbench or SDL's internal QA tools. When compared with Xbench, it does not have the very useful terminology functions that Xbench offers, but (besides the higher number of tests performed) it does have a useful advantage over Xbench: you can edit the incorrect segments directly from within QA Distiller.
On September 30 only, on the occasion of the International Translation Day, QA distiller is offered at a very special price: 100 Euro instead of the regular 1000 Euro (so a 90% discount).
The link for the special offer is www.qa-distiller.com/anniversary.
Other useful links: a flash demo of the tool, the on-line help file (use Firefox to display the online help: I had problems displaying it in Chrome) and a series of FAQs.