Library

Machining

Guerrilla guide to CNC machining and resin casting:

http://lcamtuf.coredump.cx/guerrilla_cnc1.shtml http://lcamtuf.coredump.cx/guerrilla_cnc2.shtml

Electronics

The Giant Internet IC Masturbator: (IC pinouts without pages of ads)

http://www.kingswood-consulting.co.uk/giicm/

Natural/Spoken Language

Step By Step in Esperanto For those who like their languages easy and constructed.