Software

Alyuda NeuroIntelligence
Neural network software and Excel add-ins for forecasting and data analysis. Supports several algorithms. Trial versions are available.
http://www.alyuda.com/

Amygdala
Open-source software for simulating spiking neural networks, written in C++.
http://amygdala.sourceforge.net/

Annie
Open-source neural network library for C++ (Windows and Linux). Support for MLP, RBF and Hopfield networks. Interfaces with Matlab's Neural Network Toolbox.
http://annie.sourceforge.net

Artificial Intelligence Recurrent Asymmetric Networks (NARIA)
Open project about simulating human-like intelligence with the help of neural networks.
http://naria.karasuma.net

Cortex
A back propagation neural network application.
http://cortex.snowcron.com

DELVE
A standard environment for evaluating the performance of learning methods. Includes a number of datasets and an archive of learning methods.
http://www.cs.toronto.edu/~delve/

EasyNN
Neural network software for Windows with numeric, text and image functions.
http://www.easynn.com

ECANSE
Provides a development environment for the design, simulation and testing of neural networks and their applications up to the production of an optimized software solution.
http://www.siemens.at/ecanse/

FANN
Neural network library implemented in ANSI C. Creates multilayer feedforward networks with support for both fully connected and sparse connected networks. Supports execution in fixed point, for fast execution on systems like the iPAQ.
http://fann.sourceforge.net

Fann Neural Network for Mathematica
Free interactive environment for Mathematica includes pattern recognition and time-series prediction samples.
http://www.geocities.com/freegoldbar/

Genesis
A platform for simulating complex neural systems.
http://www.genesis-sim.org/GENESIS/

Java library
Open source Java implementation of feed-forward neural nets: multi-layer perceptrons, generalized and modular feed-forward networks.
http://aydingurel.brinkster.net/neural

Joone
Java Object Oriented Neural Engine is a free java neural net framework. Can be extended writing new modules.
http://www.jooneworld.com

libF2N2
An open source neural network library. Implements feedforward neural network classes in multiple languages including C++ and PHP.
http://libf2n2.sourceforge.net/

Lightweight Neural Network++
Free software project. Implements a general feed forward neural network and some training techniques.
http://lwneuralnetplus.sourceforge.net/

LTF-Cimulator
LTF-C neural networks simulator for solving classification problems.
http://rainbow.mimuw.edu.pl/~mwojnar/ltfcim/

Netlab
A library of MATLAB functions for simulating neural network algorithms based on the book Neural Networks for Pattern Recognition by Chris Bishop.
http://www.ncrg.aston.ac.uk/netlab/

NetMaker
Simulates MLP, RMLP and Cascade-Correlation models with dynamic size adjustment algorithms. Includes various training patterns, error and activation functions.
http://www.ire.pw.edu.pl/%7ersulej/NetMaker/

Neurak
A freeware environment for development and application of artificial neural networks.
http://www.gameroom.com/quaternions/

Neural Network Framework
Class framework to create neural networks with arbitrary topology and mixed type of neurons, developed for research purpose. Includes technical information and discussion mailing-list.
http://www.nnfw.org

Neural Network Leaves Recognition
A neural network based system to recognize leaves written in Java. A Java-Applet is also available.
http://damato.light-speed.de/lrecog/

Neural Network Models in Excel
Neural network freeware for building prediction and classification models in Excel. Uses backpropagation. Can handle missing values and categorical data.
http://www.geocities.com/adotsaha/NNinExcel.html

Neural Network Toolbox for MATLAB
An environment for neural network research, design, and simulation within MATLAB.
http://www.mathworks.com/products/neuralnet/

Neural Networks at your Fingertips
Neural network simulators for eight different network architectures with embedded example applications coded in portable ANSI C.
http://www.neural-networks-at-your-fingertips.com/

NeuralWorks
Professional II/PLUS is a neural network development environment. Available for Windows and Unix. Predict is a neural network tool for solving prediction and classification problems. Available for Unix or as an Excel add-in for Windows.
http://www.neuralware.com/products.jsp

NeuroBox
An opensource .NET OOP library project written in C# to generate, propagate and train complex neural feedforward networks.
http://www.cdrnet.net/projects/neuro/

Neuromat
Model Manager for development of bayesian neural networks.
http://www.neuromat.com

NeuroMine
Neural network COM+ components and development environment for forecasting and data analysis. Supports several algorithms. Trial version is available.
http://www.neuromine.com/

Neuropilot Project
Showcases a java applet demo of a trained neural network piloting a lunar-lander type spacecraft over landscapes of various complexity.
http://freespace.virgin.net/michael.fairbank/neuropilot/

NeuroShell Predictor
Forecasting and estimation software based on neural networks. Demo version available.
http://www.mbaware.com/neurpred.html

NeuroSolutions
Icon-based neural network development software. Supports several types of networks and training algorithms. Trial version is available.
http://www.neurosolutions.com

NeuroXL
MS Excel add-ins based on neural networks. Designed for predicting, classification and financial forecasting.
http://www.neuroxl.com

NNSYSID Toolbox
A set of MATLAB tools for neural network based identification of nonlinear dynamic systems.
http://kalman.iau.dtu.dk/research/control/nnsysid.html

Penguinwerks
Open source neural network library to create multi-layer perceptrons. Written in C#.
http://www.penguinwerks.com

Pythia
Software for simulation of back propagation neural networks. Evaluation version available.
http://www.runtime.org/pythia.htm

Simbrain
A free java-based neural network simulation kit.
http://simbrain.sourceforge.net

Stuttgart Neural Network Simulator
Description of the features of the Unix and X11 based simulator, information about how to obtain the SNNS sources and an online user manual.
http://www-ra.informatik.uni-tuebingen.de/SNNS/

Temporal Difference Learning Project
Java sources for temporal difference learning Random Walk and Tic Tac Toe.
http://www.geocities.com/chen_levkovich/tdlearningproject.html

Tiberius
Neural network for classification and regression problems. Supports ODBC and Excel.
http://www.philbrierley.com

Torch
A library of state-of-the-art machine learning algorithms. Licensed under the GPL, and designed for Unix and Linux environments.
http://www.torch.ch

Tradecision
Neural network software for technical analysis and stock market trading. Demo is available.
http://www.tradecision.com/

Xerion
Neural network simulator based on C and Tcl. Made up of C libraries to build networks, and pre-built simulators.
http://www.cs.toronto.edu/~xerion/