dabba is a set of distributed network monitoring tools for Linux. Its main use is to gather or scatter actions on a network such as traffic capture, replay, generation, or monitoring. It was inspired by the Dabba Walla system in Mumbai where meals are regrouped and dispatched throughout the city with a high efficiency rate, every day of the year. The project has three main components: libdabba, a low-level zero-copy network library, dabbad, a multi-threaded task manager and IPC query processor, and dabba, a CLI for communicating with dabbad and submitting tasks.
The metric implemented in the Image::Density Perl Module estimates the density of data where there is data, and has a reasonable correlation with goodness as judged by humans. That is, if you let a human look at a set of images and judge quality, the density values for those images as calculated here tend to correlate well with the human judgement (densities that are too high or too low represent "bad'' images). It is intended for use on bitonal TIFF images, such as those from scanning paper documents.
Exiv2 is a C++ library and a command line utility for managing image metadata. It provides fast and easy read and write access to the Exif, IPTC, and XMP metadata of images in many formats. The Exiv2 command line utility prints Exif, IPTC, and XMP metadata including Makernote tags in various formats, adjusts Exif timestamps, renames images according to the Exif timestamp, extracts and inserts Exif, IPTC, and XMP metadata and JPEG comments, or deletes the thumbnail or a specific type of metadata from an image.