Grlib is an implementation of generative grammars and turtle graphics. The grammars (Lindenmayer systems) are used to produce descriptions of three dimensional objects, and the turtle is used to display them (i.e., generate images in several forms, such as bitmap, PostScript, or OpenGL).
GraphicsMagick is a robust collection of tools and libraries which support reading, writing, and manipulating an image in over 90 major formats including popular formats like DPX, DICOM, BMP, GIF, JPEG, JPEG-2000, PDF, PNG, PNM, SVG, and TIFF. A high-quality 2D renderer is included, which provides a subset of SVG capabilities. C, C++, Perl, Tcl, and Ruby are supported. Originally based on ImageMagick, GraphicsMagick focuses on performance, minimizing bugs, and providing stable APIs and ABIs. It runs on all modern variants of Unix, Windows, and Mac OS X.
Gravacacher is very simple and lightweight caching server designed for one specific purpose: to cache avatar images from services like www.gravatar.com, which provide "globally recognized avatars". Typically, Gravacacher will be deployed on sites that host blogs or forums which depend on gravatars. Gravacacher supports a security mechanism that allows it to answer only queries made via URLs generated by your server software, such as blog or forum engines, permanent cached entities, and both positive and negative TTLs when caching.
GreenPants is a simple blog system. The entries are organized with categories. There is an admin panel for managing the blog. Comments on the blog must be approved before being seen by the public. The administrator can edit, delete, and create entries, categories, and emoticons. The entries and the comments are marked up with BBCode instead of HTML. It is easy to translate to another language.
Greengrass is a C# framework providing a high-level API for the Resource Description Framework (RDF), allowing RDF triples to be parsed, stored, and manipulated. Greengrass supports serialization and deserialization of CLR types to plain RDF, OWL, and other RDF vocabularies. Greengrass should work with any CLR-complied language, like C#, BOO, IronPython, Nemerle, IKVM Java, and VB.NET.