Gpart is a small tool which tries to guess which partitions are on a PC harddisk in case the primary partition table was damaged. It works by scanning through the device (or file) given on the commandline on a sector basis. Each guessing module is asked if it thinks a filesystem it knows about could start at a given sector. Several filesystem guessing modules are built in, and others can be added dynamically.
Rmollib is a library for manipulating molecules and systems of molecules stored in pdb, gro, and pdbz files. It gives you access to molecules on the atomic, molecular, or system level. The system can be edited in memory and then dumped to disk. It is meant for use with tool such as gromacs, Gaussian, and ToFeT. Rmoltools is a collection of command line tools that use Rmollib to manipulate and edit pdb and gro files. You may find them useful, but they principally serve as an example of how to use Rmollib.
facedetect is a simple face detector for batch processing. It answers the basic question: "Is there a face in this image?" and gives back either an exit code or the coordinates of each detected face in the standard output. It aims to provide a basic command-line interface that's consistent and easy to use with software such as ImageMagick, while progressively improving the detection algorithm over time.
Cloudprint-service adds a service to your Linux computer that makes your printers available via Google Cloud Print. This can make the printer persistently available to other users, other devices, or other sites, under your control. No special printer drivers are needed to access the shared print queue.