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Picpuz is a free Linux "jigsaw puzzle" program. You can take almost any image (jpeg, tiff, png ...) and scramble it into many pieces (tens to hundreds). You can then reassemble the picture using the mouse to move the pieces around.

ParMGridGen-1.0 is a highly optimized serial and parallel library for obtaining a sequence of successive coarse grids that are well suited for geometric multigrid methods. The quality of the elements of the coarse grids is optimized using a multilevel framework. The parallel library is based on MPI and is portable to a wide range of architectures.

DIMES is a distributed scientific research project, aimed to study the structure and topology of the Internet, with the help of a volunteer community (similar in spirit to projects such as SETI@Home).

Harminv is a free program (and accompanying library) to solve the problem of harmonic inversion - given a discrete-time, finite-length signal that consists of a sum of finitely-many sinusoids (possibly exponentially decaying) in a given bandwidth, it determines the frequencies, decay constants, amplitudes, and phases of those sinusoids.

Scientific software for performing large computations is typically managed using textual control files that specify the parameters of the computation. Historically, these control files have typically consisted of long, inflexible collections of numbers whose meaning and format is hard-coded into the program. With libctl, we make it easy for programmers to support a greatly superior control file structure, and with less effort than was required for traditional input formats. The "ctl" in "libctl" stands for Control Language (by convention, libctl control files end with ".ctl" and are referred to as ctl files). Thus, libctl is the Control Language Library (where the "lib" prefix follows the Unix idiom).

Meep (or MEEP) is a free finite-difference time-domain (FDTD) simulation software package developed at MIT to model electromagnetic systems, along with our MPB eigenmode package.

ParaView is a powerful scientific visualization application, designed with the need to visualize large data sets in mind.

Veusz is a GUI scientific plotting and graphing package. It is designed to produce publication-ready Postscript or PDF output. SVG, EMF and bitmap formats export are also supported. The program runs under Unix/Linux, Windows or Mac OS X, and binaries are provided. Data can be read from text, CSV or FITS files, and data can be manipulated or examined from within the application.

The BLT Toolkit is an extension to Tcl and Tk. It adds new commands and widgets to the Tcl interpreter. Included widgets are 2D graph, barchart, stripchart, tab notebook, and tree viewer. NOTE: This kit requires as a pre-requisite the Tcl and Tk binary kits. This version uses Linux shared libraries.

The goal of the Clang project is to create a new C, C++, Objective C and Objective C++ front-end for the LLVM compiler. This is a meta port. The Clang compiler is installed by the devel/llvm-devel port.