WavPack is a completely open audio compression format that provides lossless compression, high-quality lossy compression, and a unique hybrid compression mode. The lossless compression ratio depends on the source material, but generally is between 30% and 70%. The hybrid mode provides all the advantages of lossless compression with an additional feature. Instead of creating a single file, this mode creates both a relatively small, high-quality lossy file that can be used all by itself, and a "correction" file that (when combined with the lossy file) provides full lossless restoration. WavPack employs only well known, public domain techniques in its implementation. Methods and algorithms that have ever been patented are specifically avoided. This ensures that WavPack encoders and decoders will remain open and royalty-free.
musutil includes several utilities for working with a music collection. The principle one is musview, which generates a number of "Views". Each View, analogous to a database view, is an alternative presenation of the original files. The View can selectively include only some files (based on their properties) or have files processed into into a different format, with audio filters applied, adjusted tag data, or a different filename.
Audio::BunnyMusicFile is a Perl module for working with a music collection in a high-level way. It supports the decoding and encoding of music files, tag editing, and naming based on file properties. The behaviour of the module is controlled through a flexible configuration file, allowing consistant behaviour between user applications.
Derrick is a simple tool for recording data streams of TCP and UDP traffic. It shares similarities with other network recorders, such as tcpflow and wireshark, though it is more advanced than the first and clearly inferior to the latter. It has been specifically designed to monitor application-layer communication. In contrast to other tools, the application data is logged in a line-based ASCII format. Common Unix tools, such as grep, sed, and awk, can be directly applied. Even replay of recorded communication is straightforward using netcat. Derrick supports on-the-fly compression and rotation of log files.