Colors and text effects are useful when you are reading your log files or when you are using base shell commands. ShSh is a set of skinnable commands that do it for you! ShSh scripts are written on PHP but are usable only on command line interface.
The Prolog Expert System Shell (PESS) is a software that generates ES using basically two components: KnowledgeBase, used by the ES to guide its decisions making, and Inference Machine, cable of collection the rules and generating new facts.