Free partial differential software for linux

CBL Partial Updater is an AJAX library for PHP. Unlike other libraries, all operations are controlled by the server side.

By using the library, an existing PHP script can be converted to an AJAX application in less than a minute.

Modest Ordinary Differential Equation Library is a C++ library to model rate equations.
MODEL is a numeric simulation library written during my PhD to simulate systems of rate equations describing Vertical Cavity Surface Emitting Lasers (VCSELs). I decided to write one myself after looking at existing libraries and deciding that they were either too complicated to use (having a target user base of mathematicians) or too opaque (i like to know what the code is doing, exactly).
Since most of my programming before has been done in C/C++, what you see here is a C++ library composed of various interacting classes which have the following main functionalities:
deterministic integration of any system of well-behaved differential equations.
- stochastic integration of these systems, with the possibility of specifying the correlations present in the noise
- nonlinear rootfinder, to find stationary solutions
- eigenvalue determination, for stability analysis
- easy time modulation of input parameters
- diverse data collecting classes for data analysis
- Small signal analysis (first order)
The following will be added RSN:
- Fourier transforms, for spectral analysis (although this can be done in an external program)
- Periodic solution finder
It furthermore provides a numerical vector class, vectorfunction classes, LU solver and random generators.
As I developed it using publicly available resources, GNU/Linux and other GPLed software, I decided that it should be GPL as well. However (Oh no, a "however" ! Lets hope it does not invalidate the copyleft), I would very much appreciate it if you let me know if you have used MODEL in any of your applications/simulations/research and provide a reference (this way, I can refer to your work, too).
At the moment, MODEL has the rather arbitrary version number 1.0. Meaning it is useful. Period. Some interfaces (especially the stochastics) might still change, and I would like to add some ieee floating point exception trapping to avoid silly numerical errors.
Enhancements:
- Add features/limitations/changes here

Pizza Business project is a game in which you can create your own pizza business.
Pizza Business is a platform-independent restaurant simulation game written in object-oriented C++. It utilizes the WxWindows library.
Enhancements:
- Corrected date errors in this Changelog file (it said "2002" instead of "2003" on recent releases) -tsarkon
- Save/Load feature has been buggy. This have been fixed in this version. -ares32585
- The binary file has been moved to the bin directory (Makefile controlled) -tsarkon
- Partial implementation of Linux UI installation script -tsarkon

Aeris is a nice, light maccy theme for KDE. Enjoy this, and please comment any suggestions you have.

Overall design, QtCurve theme, color scheme, (partial) Emerald theme: SaikoBee

Design suggestions, The freakin sweet buttons for the Emerald theme: Pox "Insane Vector Man"

Special thanks: Snicket, for coming up with the name for this theme!

RISO provides an implementation of distributed, heterogeneous belief networks.
RISO is an implementation of heterogeneous, distributed belief networks in Java. A belief network is a probability model defined on an acyclic directed graph; distributed means nodes can be on different hosts, and heterogeneous means allowing different conditional distributions.
The calculations involved are multidimensional integrations; exact results are known for a catalog of special cases. If a partial result cannot be calculated as a special case from the catalog, RISO computes an approximate result by numerical integration.
Partial results are passed from one node in the graph to another as messages; if nodes live on different hosts, the belief network is said to be distributed. Messages are passed via RMI. Many example belief networks and lengthy documents are included in the RISO release bundle.
Enhancements:
- The "Jellyfish" release of RISO contains minor bug fixes and some functional enhancements.
- There is a Python module riso_binding.py which can import RISO belief networks into Jython (Python implemented in Java).
- Jython is a more flexible and elegant user interface than riso/apps/RemoteQuery.java.
- The compile.sh script uses JavaDeps to generate a makefile (javac wasnt capable of resolving all the cross dependencies). Youll need JavaDeps only if you want to do a clean recompile; recompiling one file at a time with javac (given all the other class files present) has always succeeded so far.
- There are now Poisson, exponential, and binomial distributions.
- There is initial support for the notion of considering a belief network as a multidimensional distribution. See riso/distributions/Factorized.java.
- There is an initial version of a Gibbs sampler algorithm. See riso/apps/GibbsSampler.java.

ScatterChat is a HACKTIVIST WEAPON designed to allow non-technical human rights activists and political dissidents to communicate securely and anonymously while operating in hostile territory. ScatterChat is also useful in corporate settings, or in other situations where privacy is desired.

It is a secure instant messaging client (based upon the Gaim software) that provides end-to-end encryption, integrated onion-routing with Tor, secure file transfers, and easy-to-read documentation.

Its security features include resiliency against partial compromise through perfect forward secrecy, immunity from replay attacks, and limited resistance to traffic analysis... all reinforced through a pro-actively secure design.

PHAMLs primary initial goal of the PHAML project was to produce a parallel version of MGGHAT. This has subsequently been extended to include additional capabilities. The target architecture is distributed memory multiprocessors, such as Beowolf-type PC clusters.
MGGHAT is a sequential program for the solution of 2D elliptic partial differential equations using low or high order finite elements, adaptive mesh refinement based on newest node bisection of triangles, and multigrid. All aspects of the method are based on the hierarchical basis functions.
Adaptive refinement, multigrid and parallel computing have each been shown to be effective means of vastly reducing the time required to solve differential equations. However, effectively combining all three techniques is not easy and is the subject of current research. PHAML is an attempt to solve this problem.
Enhancements:
- Native conjugate gradients and GMRES solvers were added, along with support for DRUM and ZOLTAN_FILE in partition methods. -
- The tests have been modified to run in parallel, and assorted bugs have been fixed.

Somatic project is a generic 3D puzzle solver for soma and pentomino-like puzzles.

Somatic is a generic 3D puzzle solver for soma and pentomino-like puzzles. For an arbitrary set of pieces and a figure with not more than 64 cubes, it can check whether this figure can be built using these pieces and return one or more solutions.

It can also solve split figures that are not connected and partial figures, which do not need all pieces to be built.

Piece sets that can be solved include but are not limited to the soma cube, the somaplus set, the doublesoma set, the bedlam cube, and the pentomino set.