Tierra is an artificial life system for studying the evolution of digital organisms. Tierra consists of a virtual computer and its operating system, whose architecture has been designed in such a way that the executable machine codes are evolvable.
Memory is organized into informational patterns that exploit CPU time for self-replication.
Mutation generates new forms, and evolution proceeds by natural selection as different genotypes compete for CPU time and memory space. Diverse ecological communities have emerged. Distribution of binaries for any platform is not permitted. Daniel Pirone . DOS-only tool for analysis of Tierra output.