Crypto-avr-lib is a set of implementations of different cryptographic primitives.

Another FORTH implementation - this one is for Propeller chip.

Amforth is a compact forth interpreter and compiler for the atmel avr atmega microcontroller family which is implemented in assembly language and amforth itself. It is an interactive system running completly on the controller. It does not need additional hardware beyond a power supply.

Old magazines, old OS, old games source code, all's old today.

EASy68K is a 68000 Structured Assembly Language IDE. EASy68K allows you to edit, assemble and run 68000 programs on a Windows PC. No additional hardware is required. EASy68K is an open source project distributed under the GNU GPL.

How to turn a PIC18 into a B&W Text & Graphics PAL video processor with a very few and inexpensive hardware, and a minimum of coding effort?

A book by Peter Knaggs and Stephen Welsh - download for free.

A couple of links for lightweight reading about one of the simplest programming logic chips. With my schematics and GAL programming tool.