RightMark Audio Analyzer 5.1 has been released. The test suite performs various tests of electroacoustical performance of sound cards and other real-time audio devices. Testing is accomplished by playing the test signals and recording them after they pass through the testing chain. New features include:

Support of MDF (Microphone Data File) format;
Extended range of possible frequencies for the level calibration tone;
Several bugfixes.

http://audio.rightmark.org/download.html