I occasionally get to work on my own projects. Here's a couple of open source projects I work on when I've got time.
A twitter client for Windows written in c# and WPF, with a clean simple interface. Functionality at the moment :- Checks automatically for new tweets, alert box for new tweets, update the user's status.
A javascript/jquery based image gallery.
A javascript based widget for letting users give star ratings.
This is an image searching utility/API. Search for images based on color distribution and shape, very fast searching once the images are loaded.
This site is built using MVC 4.0 and C#.