A former commercial product released on 1/3/00 by UserLand Software under an open source license, MacBird is a draw program with grouping and alignment that's used to design and run graphical user interfaces. It features object based graphics, draw-type commands, fast rendering, and designer-oriented features like grouping and alignment. Though it is currently a Mac application, it may be ported to Linux and Windows.
License: MIT Open Source License
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!