SmartImage is a powerful reverse image search tool for Windows
small console GML or graphviz DOT graph viewer
eGPXviewer is a 3D GPX track viewer
Simple drawing program for Linux
interactive 2D plotter
Scripts to make emacs, pdfsync and xpdf work together.
View and alter images (batch processing available).
A graphical, multiplatform ANSI files viewer and converter
Browser interface to your memories
DuMP3 is a duplicate and similar file finder.