The CrocoCosmos tool was developed as part of the Crocodile tool set for the analysis and visualization of large object-oriented software systems. The context of our research is to support maintenance and re-engineering processes in an appropriately automated way for large programs. One aspect is program comprehension through the visualization of program structures on an architectural level. Thus, CrocoCosmos is not a general graph drawing tool but serves a dedicated purpose in a specific graph drawing application.