GRIND software available at: http://www-binf.bio.uu.nl/~rdb/software.html

GRIND is a powerful and simple system for analyzing systems of ordinary differential equations (ODEs) and maps. Maps and ODEs are formulated like:

x'=r*x-b*y^2;

GRIND allows you to draw trajectories, do time plots, draw nullclines, compute eigenvalues/vectors, and do simple bifurcation analysis.

This is all driven by a simple command language. GRIND works on MS-DOS and Unix platforms and creates X11, PostScript, Iris-gl, and MS-DOS graphical output. GRIND can be obtained by anonymous ftp and an HTML version of the manual and a tutorial are available online. For linux you also can obtain a binary RPM. The RPM is currently supplied for Redhat 7.3 only. You can build the RPM for your system from the source rpm in the SRPMS directory using the command:

rpm --rebuild PROGRAM.src.rpm

There is also a version of GRIND for MS-DOS systems, which is also available by anonymous ftp This however requires Microsoft Fortran.