darktable is a virtual light table and darkroom for photographers. It manages your digital negatives in a database and lets you view them through a zoomable light table. It also enables you to develop raw images and enhance them.
Fat Free CRM is a customer relationship management platform. Out of the box, it features group collaboration, campaign and lead management, contact lists, and opportunity tracking.
An astronomical Webcam image processing application.
A geocaching query tool.