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gnuplot
[72 users on Ohloh] |

gnuplot plots 2d and 3d graphs, from a data file or with a formula. It has an interactive mode with online help, or it can be used non-interactively. gnuplot does function fitting to data sets, and it does output to many terminals, among which are PostScript, X11 display, PNG, and GIF (via the old gd library).

xmds
[1 users on Ohloh] |

XMDS is a code generator that integrates equations. You write them down in human readable form in a XML file, and it goes away and writes and compiles a C++ program that integrates those equations as fast as it can possibly be done in your architecture.

grafwerk
[0 users on Ohloh] |

Grafwerk is intended to be a general purpose tool for researchers in graph theory. Providing functionality for importing/exporting and manipulating graphs in ways that are interesting to the graph theory community is this projects main goal.