The 8bit Zilog z80 processor was quite widespread in the late 70ies and early 80ies as CPU for business and home computers. Nowadays, it's mainly used in measuring and controlling for various purposes.
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Icarus Productions - Z80 coding
Z80 programming tutorials, utilities and FAQ for beginners.
The New Image
Z80, R800 and GBZ80 cross assembler tniASM for MS-DOS and Win9x.
A portable Z80 cross assembler. Short description and download. Available in English and Spanish.
RAZE Multi Asm Z80 Engine
Z80 emulator for Intel based x86 systems. [CAESAR]
Thomas Scherrer Z80-Family Official Support Page
Information about programming, hardware, software, utilities, CPUs, and assemblers for the Z80 processor family.
Z80 Assembly for Novices
A series of lessons introducing z80 assembly at a semi-beginner level and slow pace. Factual knowledge and pieces of advice concerning programming are intertwined. Includes detailed explanation for all the instructions organised in categories.
Programming documentations and tutorials for the z80 CPU and the TI-83 calculator.
Z80 Simulator IDE
An application that supplies Z80 developers with graphical environment for Windows and integrated BASIC compiler, assembler, simulator (emulator), disassembler, and debugger.
A compiler of the Z80 CPU assembler, runs on DOS, Linux; written in C.