Jmol is a Free, Open Source molecule viewer and editor. It is a collaboratively developed visualization and measurement tool for chemical scientists. Jmol is an active project, and there are new features being added to it on a daily basis. Users are encouraged to modify it to fit their needs and to contribute their changes to the project.
Yacas is a general purpose, easy to use Computer Algebra System (a CAS is a program that can be used to do symbolic manipulation of mathematical expressions). It is built on top of its own programming language designed for this purpose, in which new algorithms can easily be implemented. In addition, it comes with extensive documentation on the functionality implemented and methods used to implement them.
The NumericalChameleon converts numbers with a precision of up to 1000 significant figures. It supports more than 3200 units in 82 categories, including lengths, areas, volumes, durations, bits & bytes, angles, temperatures, exchange rates, Roman numerals, spoken numbers, all 35 radixes, unicode, colorcode, int. dial codes, timezones, date calculations and more. You have unlimited access for adding, modifying, and deleting categories, units, and icons. Update exchange rates with the GUI or at the command line. All configuration data are stored in flat files.
The Chemistry Development Kit (CDK) is a library of Java classes for chemo-, bioinformatics, computational chemistry, and chemometrics. It provides important algorithms like substructure search, SMILES, Gasteiger charges, QSAR descriptor calculation, 3D structure generation, 2D layout and rendering, many IO formats, atom typing, and more.
Jacksum is a platform-independent utility for computing and verifying checksums, CRCs, and message digests, as well as timestamps of files. It supports most common checksum algorithms. The format of the output is fully customizable. The program is large-file-aware, and recursive file processing as well as platform-independent file verification are supported.
Tux Paint Default Stamps is a collection of hundreds of "rubber stamp" images (and associated descriptions and sound effects) for the children's drawing program, "Tux Paint." Both PNG and SVG images are included. Categories include animals, clothes, food, hobbies, household, medical, military, natural forces, people, plants, seasonal, space, sports, symbols, town, and vehicles.
BioCoRE is a collaborative work environment for biomedical research, research management, and training. It features easy-to-use tools, among them co-authoring papers and other documents, running applications on supercomputers, sharing molecular visualization over the Internet, notifying project team members of recent project changes by email, chatting, keeping a lab book, and other practical features.