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Auogg is a simple Ogg/Vorbis player for the Network Audio System. It's based on libaudio, libvorbis, and libogg, and relies on the Argp facility of the GNU C Library. As a result, it's really tiny (about 13 KiB C source and about 11 KiB compiled binary).

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FDRDF is a tool that builds a catalogue of descriptions in an RDF representation of the specified files. The descriptions currently include: file status (as per the stat system call); SHA-1 hash over the file contents; MIME type (as guessed by the file tool), geospatial metadata (as per GDAL), and GRIB file composition (as per GRIB API).

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Mapx is a coordinate transformation library developed at National Snow and Ice Data Center (NSIDC). It was initially developed from equations given by Snyder (1982). Additional projections have been added as needed. The C version currently supports 11 common projections, in both spherical and ellipsoid forms when appropriate. The Java version lags behind somewhat and currently supports nine common projections, in both spherical and ellipsoid forms when appropriate.

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MMLi is a simple Music Macro Language interpreter written in ISO C99. The Music Macro Language originated in 8-bit BASIC implementations (as part of the “PLAY” command), and can still be found in modern BASICs (like QB64) and in system software (like FreeBSD's spkr.c driver.) This interpreter features an example "mmlitest" program which can be used to translate MML sequences into beep(1) commandline arguments.

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The NetCDF package consists of a few tools to operate on NetCDF and, by utilizing the compatibility API, HDF4 files. The tools are intended to be used from shell scripts. They include a couple of simple shell wrappers over the respective NetCDF functions (ncattget and ncattput) and a more sophisticated ncget tool. The ncget tool delivers (for NetCDF) or complements (for HDF4) the functionality of the "hdp dumpsds" command. It allows a selected part of a NetCDF variable or an HDF4 scientific data set (SDS) to be extracted in either an ASCII or binary form, applying the transformation specified by the scale_factor and add_offset attributes. This tool allows one to feed the data of NetCDF variables (or HDF4 SDS) to other tools designed to operate on either ASCII (text) or raw (binary) data.

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Serial TUN/TAP Encapsulation (Stuntapen) is a simple program that implements a SLIP (RFC 1055)-like algorithm, extended to allow either IPv6 packets (when using a TUN device) or Ethernet frames (when using TAP) to be transferred over some kind of a serial line, such as a computer's serial port, a TCP stream, or an SSH session. When used together with Netcat or SSH, it could be used to create a crude but working IP tunnel or VPN, or to forward IP traffic to a low-feature embedded system via a serial line or USB, or for educational purposes.