Yep.

DrDepth - Sea bottom mapping software

Basically it creates a database of depth and position info from a depth sounder with nema output. Using the data, you can create 3d surface plots of the lake bottom. Also, with Lowrance units you can use the map info to create maps for the Lowrance unit itself. Don't know about others, but I've rarely seen commercially available maps that were very accurate as far as depth contours. I might have to buy the basic package just to play with.