DEREK - dynamical systems exploring 

S.P.Kuznetsov "Dynamical chaos"

http://fizmatlit.narod.ru/webrary/kuzn/kuzn.htm  (in russian)

Saratov group of Theoretical Nonlinear Dynamics

http://www.sgtnd.narod.ru/eng/index.htm

http://www.itb.cnr.it/cellcycle/models.php

PHASER - a universal simulator for Dynamical Systems

http://www.phaser.com/

Dynamics Solver - a powerful tool for research in nonlinear dynamical systems

http://tp.lc.ehu.es/jma/ds/ds.html

A tool for dynamical systems research by Bard Ermentrout

http://www.math.pitt.edu/~bard/bardware/tut/xpptut.html

Dynamical Systems section of Wolfram Mathworld

http://mathworld.wolfram.com/topics/DynamicalSystems.html

An article about dynamical systems in Wikipedia

https://en.wikipedia.org/wiki/Dynamical_system

Sprott systems - a set of systems with chaotic dynamics

http://sprott.physics.wisc.edu/simplest.htm

Solving Ordinary Differential Equations: Nonstiff Problems

by Ernst Hairer, Syvert P. Nørsett, Gerhard Wanner

http://books.google.com.ua/books/about/Solving_Ordinary_Differential_Equations.html?id=F93u7VcSRyYC

Ernst Hairer, personal page

http://www.unige.ch/~hairer/

Wink - a free computer program for creating tutorials and presentations

http://www.debugmode.com/wink/

Xnview - software for reading, viewing, and processing images

http://www.xnview.com

ATOMOSYD - a website of research group from University of Rouen devoted to dynamical systems topological analysis and modelling

http://www.atomosyd.net