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.
Binary Puzzle Solver in Ruby is an automated solver for Binary Puzzles (a kind of logic game) featured on http://www.binarypuzzle.com/. The solver contains an API and a commandline program and explains why it thinks the player should place a 0 or a 1 in the box. Although it contains only a subset of the moves the authors could think of and does not use backtracking, it was able to solve all the puzzles from binarypuzzle.com which the authors tried.
Ruote is a workflow engine. It's a runtime for long running business processes. Processes are explicitly defined and may be explicitly handled (start, pause, cancel, update). A process is started by handing a business process definition to the engine. A process definition is expressed in ruote’s own process definition language, which comes in three flavours: XML, a Ruby DSL, and Radial. A process definition describes the flow of work among participants. A ruote engine can simultaneously handle multiple process instances, created from one or more different process definitions. A process instance can be modified on the fly.