An Inkscape extension for editable (digital) timing diagrams in publication quality, based on a very simple state-oriented language for signal description.
G2C (Geospatial to Civil)
The LandGML Interoperability Experiment initiated by Autodesk, U.S. Army Corps of Engineers Engineering Research and Development Center, and Galdos Systems. this open source tool transforms LandGML into LandXML documents.