cgvg is a pair of Perl scripts ("cg" and "vg") which are meant to assist a programmer in doing command-line source browsing. The idea was to be a temporary replacement for cscope until there was a good GPLed cscope available, but there are some advantages to cgvg (as well as some disadvantages). "cg" does the search through code, storing matches in the user's home directory and displaying matches, and "vg" opens an editor at the line in the file where a particular match was found. Some features include color and human-readable output, resizing to screen width, support for many editors, recursive searching, a per-user configuration file, etc.
changetrack is a program to monitor changes to files. If files are modified one day, and the machine starts working incorrectly some days later, changetrack can provide information on which files were modified, and help locate the problem. Changetrack will also allow recovery of the files from any stage.
ChemApp is a programming tool from the area of computational thermochemistry. It is a library consisting of a rich set of subroutines, based on the thermodynamic phase equilibrium calculation module of ChemSage. It permits the calculation of complex, multicomponent, multiphase chemical equilibria and their associated energy balances. ChemApp is available as object code for a wide range of platforms and as a shared library/DLL. ChemApp "light" is the free version of ChemApp, and although it is restricted in two ways compared to the regular version, it gives you almost the same functionality.
Ciao is a complete Prolog system subsuming ISO-Prolog with a novel modular design which allows both restricting and extending the language. Ciao extensions currently include feature terms (records), higher-order, functions, constraints, objects, persistent predicates, a good base for distributed execution (agents), and concurrency. Libraries also support WWW programming, sockets, and external interfaces (C, Java, TCL/Tk, relational databases, etc.). An Emacs-based environment, a stand-alone compiler, and a toplevel shell are also provided.