An online tool for creating and publishing simple UML diagrams.

Turns text into UML sequence diagrams

An open source book written and edited by Bruce Eckel with contributions and help from the Python community. Published under the Creative Commons Attribution-Share Alike 3.0 license. To download the current version of the HTML book and example code, click the "download" link you'll see in the upper right. This includes the sources for building the book.

" gEDA project has produced and continues working on a full GPL'd suite and toolkit of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture, simulation, prototyping, and production. Currently, the gEDA project offers a mature suite of free software applications for electronics design, including schematic capture, attribute management, bill of materials (BOM) generation, netlisting into over 20 netlist formats, analog and digital simulation, and printed circuit board (PCB) layout."