HDRFlow is a framework to process high-dynamic range (HDR) and RAW images. It's written in C++, and is both cross-platform and hardware accelerated on modern GPUs.
Browsershots is a system for capturing screenshots of Web pages in many different browsers. When a user submits a web address on the central web interface, the screenshots are made automatically on distributed computers that are run by volunteers.
PennAve is a dynamic photo gallery software written in Python and designed for use alongside F-Spot. It makes heavy use of XML and XSLT for ease of presentation modification and sharing of information with other users, web sites, and programs.