There are a number of online apps that can show students the phase plane dynamics of a 2d system. Notable examples include:
Phase Portrait Viewer from the d’Arbeloff Interactive Math Project – requires Java installed
Wolfram Phase Portrait Viewer – required Mathematica CDF Installed
Programmable Interactive Simulator (DField and PPlane) – requires Java (Matlab version also available I believe)
Nevertheless I decided, just for the hell of it to write my own, this time a desktop application for windows. Screen shot and download link below:
The download is below. Nothing to install, the application is a single exe that you just run. Works on Windows and Wine emulator.
Written using Delphi XE.