Trees, Plants...from grammars (rayshade), Graphtal is a tool for manipulating spT0L-systems (context free, table oriented L-systems with stochastic productions). graphtal reads a file containing an L-system description and starts the interpretation. In addition, graphtal is able to interpret the result graphically, producing different kinds of output. The main reference for the program is the book The Virtual Laboratory: The Algorithmic Beauty of Plants by P. Prusinkiewicz and A. Lindenmayer. The language used in graphtal is different from the one in the book and will be described completely in the documentation. Include C source (GCC), Author: Christoph Streit, Ported by: Lucas Ammon