Programs
Paper Soccer, C#
This game was inspired by paper game i played through primary and high school. In highschool I even wrote similar game in Pascal, but unfortunately I lost the source code. New version was much easier to write in C#. I wanted to keep the look and feel close to what you get on paper and honestly I recommend playing on real paper with two different color pens.
FITS Viewer, C#
This little program is handy when you need to see astronomical images stored in FITS format.
Eagle Nebula images from Hubble Space Telescope in FITS format:
Ellipse, C#
If you ever need to fit an ellipse to cloud of points, try out this program!
Example data files with 2D points: clouds.zip.