YASP (YetAnother Simple Processor) is a 8-bit microprocessor with microcontroller capabilities (I/O ports, REQ, ACK) that can be used as a small computer for educational purposes. Its development environment includes simulators and assemblers.
YALC is a virtual architecture designed for educational purpose. It models a DLX-like processor and its set of ASM instructions, a compiler from a high level language (C-like), and an IDE with syntax checking and highlighting.