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rsim is a simple discrete-event communications network simulator initially developed to test routing protocols for undersea acoustic modem networks. If done well then rsim will eventually be a good replacement for "ns2".
pyomnet provide an object-oriented way to define the network topology.
It's a good way to illustrate network in an abstract way.
pyomnet could generate the NED scenario and configuration(latter) for OMNeT++ simulation tool.
A package for preference handling and aggregation rules. A number of voting rules discussed in social choice literature have been implemented in order to study various properties of these rules in simulations with randomly generated preferences.
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Cellogica is a cellular logic analysis tool. It incorporates sequential logic and finite state machine to elucidate the relationship between transcription factors and corresponding gene expression.
MANIKK is a toolkit for generating numerical interaction parameters -- describing the interaction between metallic atoms in a coherent lattice -- and for performing numerical Monte Carlo-simulations of physical properties of alloy systems.
gCoder is a GUI, server-client based dyanmic programing contest controler built in Python. Its a programing contest controller like pc^2 and TopCoder(TM) areana. It use system test module, which can actually test contestent codes without any human interf
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KU1K is a set of tools for 4D,5D and 6D compact U(1) lattice gauge theory Monte Carlo simulation using the Skipis-Vantzos algorithm. As the calculations involved, even for the 4D case, are consuming, the project is modular so as to run on the Grid.
A collection of modules and enduser tools designed to help design, test and use system models. While my research (hence, the examples) is focused on hydro-ecological systems, the program can be used on any system characterized by ODEs (and soon PDEs?)
SimED is a user-friendly Differential Equation simulation software. It can integrate numerically ODEs (Ordinary Differential Equations) using several methods, plot time and phase-space diagrams for variables, and interactively choose initial conditions.
FEVal, the Finite Element Evaluator written in Python, provides easy conversion for many Finite Element data formats (both binary and ascii). Mesh modification is very easy. Values of model results can be accessed given coordinates in physical space.
Simulator for large neuronal networks using leaky INF as its basic element. Simple few line scripts will enable rapid creation of large networks with different connectivities. Aimed at researchers interested in quickly testing large networks of neurons.
The "RISC-0" project is a collection of Python libraries and programs to support the RISC architecture described by Prof. Niklaus Wirth on his web page (http://www.inf.ethz.ch/personal/wirth/Articles/FPGA-relatedWork/index.html)
SimForge is a web-based Agent Based Model of an Open Source Ecosystem implemented in Python with Django. Developers act on randomly drawn preferences to create, collaborate, and use software.
aVolve is an evolutionary/genetic algorithm designed to evolve single-cell organisms in a micro ecosystem. It currently uses the JGAP Genetic algorithm, but does include a primitive genetic algorithm written in Python.