Eqdiff (silly abbreviation for differential equation...) is a program intended to draw the ingral lines of differential equations, vector fields, ans also level curves and simple functions.
It is meant to be easy-to-use: there's a function which makes the program (try to) guess which curves to draw for a given function, so that the user can (should) get a whole picture of the vector field with a single command. The program can be controlled by mere mouse clicking. The output can be saved or exported as an image.
There are two versions : for Unix and Windows.
Example of a picture obtained by the Panorama command on the differential equation y'=y2-x