QNapi is free, Qt4-based application designed for automatically downloading and matching subtitles for your movie files. It uses NapiProjekt (http://www.napiprojekt.pl) and OpenSubtitles (http://www.opensubtitles.com) databases. Works under Linux, Mac OS
Works fine on OpenSuse 12.3 with KDE 4.10. One thing that would be really cool is to have context-menu: find subtitles.
Qnapi works fine.
very good project