Here is the Scandroid for Mac (OS 10.4, probably also 10.3) and Windows (tested on Vista and 7, should work on others). The Manual, a 20-page .pdf file, is available here for separate download. It includes some discussion of theoretical issues as well as practicalities.
The Scandroid is published under a GNU Public License. It's written in Python (2.7) and uses wxPython (3.0) for its graphic interface. It was developed using the WingIDE (www.wingware.com). Under the GPL you're welcome to change the program. I would appreciate a copy of any changed version. The source code (eight modules) can be downloaded from GitHub: