GEDA:
DOC:
http://wiki.geda-project.org/geda:documentation
Tutorials:
http://wiki.geda-project.org/geda:gsch2pcb_tutorial
http://www.delorie.com/pcb/docs/gs/gs.pdf
http://hobby-electrons.sourceforge.net/tutorials/gEDA/index.html
http://wiki.geda-project.org/geda:gschem_warmup
Symbol creation:
http://wiki.geda-project.org/geda:gschem_symbol_creation
http://wiki.geda-project.org/geda:transistor_guide
Footprint creation:
http://wiki.geda-project.org/geda:pcb_footprints
http://wiki.geda-project.org/lib/exe/fetch.php?media=geda:land_patterns_20070818.pdf
Symbols & Footprints:
Tragesym:
http://wiki.geda-project.org/geda:tragesym_tutorial
Manual:
http://pcb.geda-project.org/pcb-cvs/pcb.pdf
Other:
http://www.linuxfocus.org/English/December2004/article355.shtml
https://www.linuxjournal.com/article/8438
https://wiki.archlinux.org/index.php/GEDA
PCB:
http://wiki.geda-project.org/geda:pcb_tips
http://wiki.geda-project.org/geda:pcb-quick_reference
Useful stuff:
About Geda GAF:
https://en.wikipedia.org/wiki/GEDA