pHash is an implementation of various perceptual hashing algorithms. A perceptual hash is a fingerprint of a multimedia file derived from various features from its content. Unlike cryptographic hash functions that rely on the avalanche effect of small changes in input leading to drastic changes in the output, perceptual hashes are "close" to one another if the features are similar. Potential applications include copyright protection, similarity searches for media files, or even digital forensics.
VideoCache is a squid URL rewriter plugin written in Python that traps the requests to Squid for various audio/video Web sites and caches the audio/video in the local storage on a proxy server for serving subsequent requests for the same audio/video. It caches the audio/video independently of Squid's caching system. The cached files are stored in a browsable fashion.