Gubed PHP Debugger is, as the name suggests, a program that will help you debug your PHP scripts. It supports stepping through code, watching and setting the contents of variables, and normal and conditional breakpoints. No changes are needed to server software or scripts being debugged.
Guido van Robot, or GvR for short, is a minimalistic programming language that provides just enough syntax to help students learn the concepts of sequencing, conditional branching, looping, and procedural abstraction. Its biggest strength is that it permits this learning in an environment that combines the thrill of problem-solving with instant visual feedback.
GutenPy makes it easier to find and read books from Project Gutenberg. It has handy bookmarking, line numbering, and word definition lookups. Its catalog browser can use simple or complex regular expression filters for title, author, and subject, and allows you to create a booklist of wanted items that can be saved and downloaded later.
Gwenhywfar is a multi-purpose library that provides useful functions such as configuration file handling, a full featured message generation and parsing engine, and an operating system abstraction layer. It is used by Libchipcard2, AqBanking, QBankManager, OpenHBCI, AqMoney, and various other projects.