Some links:

site for the DIY metal worker
[link to www.armourarchive.org]

Home made guns:
[link to www.thehomegunsmith.com]

Has some stuff:
[link to www.bombshock.com]

wilderness survival tools:
[link to wildwoodsurvival.com]

There's info. on this page on how to open gunlocks quickly.
[link to www.engadget.com]

Plenty of hot heads advice: (I decided not to contribute bunch here since they remove stuff all the time and act annoyingly but find advice for extreme situations)
[link to www.zombiesurvivalwiki.com]

Kid stuff thats helps sometimes/ slingshots/ kid teaching:
[link to www.instructables.com] The DIY site for all things (sort of)