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The GPSTk is an open source C++ library for developing GPS applications. The GPSTk suite consists of a core library, auxiliary libraries, and a set of applications. The GPSTk provides a wide array of functions that solve processing problems associated with GNSS such as processing or using standard formats such as RINEX. The libraries are the basis for the more advanced applications distributed as part of the GPSTk suite.

WeatherSpect provides a reasonably accurate simulation of what the weather looks like outside, in ASCII art. It includes rain, snow, lightning, sleet, and hail. The windspeed and cloudiness are reflected in the velocity and quantity of clouds. There are trees that age, reproduce and die over the course of an hour, and a sun and moon that follow the actual sun and moonrise. There's also a dancing turtle.

Astro::FITS::CFITSIO is a perl interface to William Pence's cfitsio subroutine library. For more information on cfitsio, see http://heasarc.gsfc.nasa.gov/fitsio. This module attempts to provide a wrapper for nearly every cfitsio routine, while retaining as much cfitsio behavior as possible. As such, one should be aware that it is still somewhat low-level, in the sense that handing an array which is not the correct size to a routine like fits_write_img() may cause SIGSEGVs.

Grip is a front-end to external cd audio rippers (such as dagrab or cdda2wav). It also provides an automated frontend for MP3 encoders, letting you take a disc and transform it easily straight into MP3s. The CDDB protocol is supported for retrieving track information from disc database servers. Grip works with DigitalDJ to provide a unified "computerized" version of your music collection.

MAD is a high-quality MPEG audio decoder. It currently supports MPEG-1 as well as the MPEG-2 extension to Lower Sampling Frequencies. All three audio layers (Layer I, Layer II, and Layer III a.k.a. MP3) are fully implemented. MAD does not yet support MPEG-2 multichannel audio (although it should be backward compatible with such streams) or AAC, nor does it support the so-called MPEG 2.5 format. This is ID3 tag library, which is part of the project. LICENSE: GPL2 or later

Sndio is a small audio and MIDI framework part of the OpenBSD project. It provides an lightweight audio & MIDI server and a fully documented user-space API to access either the server or directly the hardware in a uniform way. Sndio is designed to work for desktop applications, but pays special attention to synchronization mechanisms and reliability required by music applications. Reliability through simplicity are part of the project goals.

A real-time signal analysis tool and an offline time-frequency browser. It has a built in tone generation capability and it can play back audio files with a multitude of effects and filters. Designed for environmental analysis missions that range from modulation parameter measurements to searching for transient signals that go bump in the night, baudline combines fast digital signal processing, versatile high-speed displays, and continuous capture tools for hunting down and studying elusive signal characteristics.

mp3lint is a tool to check collections of audio files for various problems. It is highly configurable, allowing you to specify your preferred format for filenames, minimum bitrate, tests to ignore, etc. Formats checked are currently mp3, ogg, wav, flac, au, and m3u playlists. mp3lint is implemented as separate tools (perl modules), each of which implements a set of tests. There are a total of 32 different tests.

Squash is a C/Ncurses based music player. It supports mp3 and ogg through libraries (and planned flac support). Squash uses statistics to determine songs to play automatically. It garners this information through whether or not a song is skipped. Squash also avoids picking the same song twice. Thus Squash is like a radio station that plays the songs you like -- and you don't even have to call in requests!

Sexypsf is an XMMS plugin for playing .psf files. The PSF format brings the functionality of NSF, SID, SPC, and GBS to next- generation consoles. PSF utilizes the original music driver code from each game to replay sequenced music in a perfectly authentic, and size-efficient, way. The general idea is that a PSF file contains a zlib-compressed program which, if executed on the real console, would simply play the music.