This PHP script can be used to check visually the consistency of data in a flat file. It let you visually check fields content, fields with wrong format (numerical or text), misplaced data and let you alter data content with scripting.
Python port of windows bubbles application (http://bubbleshq.com). It lets you embed a webpage as desktop application that appears as a status icon. The webpage can be scripted via javascript to handle communication between the web application and the desktop
This program feeds a sqlite database with files and their checksums (SHA1 by default) from two different folders and subfolders. It can be used to tell if all files of the source directory are in the destination folder, whatever their path may be (the comparison is made by checking the missing checksums in destination)