Ljava - site - Mutating L-Systems with Java and VRML.RayTraced Evolution - RayTraced Evolution is an extension to the standard Lindenmayer Systems featured below. It allows the embedding of C-style macros into the production system. It is capable of producing some wonderful virtual sculptures.
Laurens Lapre's Lsystems and Lparser - A good introdution to Lindenmayer systems by the author of LParser.
LGrammar - A graphics tool for Lindenmayer systems in C and Java.
Przemyslaw Prusinkiewicz - Co-author of "The Algorithmic Beauty of Plants" with Aristid Lindenmayer.
Biological Modeling and Visualization - The biological modeling and visualization research page includes links to the "Virtual Laboratory", papers, example Java applications, and an errata for "The Algorithmic Beauty of Plants".
L-System 4 - A program which uses text based instructions (seed files) to build complex 3D objects.
Advanced Aspects of L-Systems - A tutorial written for users who are interested in learning the features and modules of L-Systems