BaduK is a piece of software written in C++ with Qt. It lets you create databases from sgf files and analyse the winning percentages of opening lines.
It can be found at both GitHub and Sourceforge, though the latter came with an installer.
It was written by Neil McLean, a Scottish Go player ( EGD).
 DuEm6: Was the github repository deleted? It has ceased development anyways according to http://baduk.sourceforge.net/.