Support for Windows and Linux. Free and open source. Includes 3D rendering support via Wings3D(GNU).
Land Pattern Design
"Open Symbol Project" with Mark Whitis - “The Open Symbol Project aims to create an open collection of schematic symbols and PCB footprints released under a license that does not interfere with use in either commercial or free projects.”
PCB Matrix has two tools that are useful for creating land patterns for SMT components (Windows only)