It seems that the publisher's website hasn't been active since 2015.
Note: It seems that this software hasn't been updated for several years - the version linked to this page is the latest to exist, so do not bother searching any further.
Have you already viewed a video that is not synchronized with the audio? It seems that the sound is a little late or slightly ahead of the video. With Audio Video Synchronizer, you can remedy this problem by aligning the images perfectly with the soundtrack.
This is a shareware version. You can buy the full product from the publisher's website for $47.99.