http://www.avocetsystems.com/

adc-z80demo.zip
adc-z180demo.zip 
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These are Windows IDE cross-compilers/assemblers/simulators for the Z80 and Z180 CPUs from Avocet Sstems:

"From C compilers, assemblers, to simulators, we build the professional tools you need, offer the customer service you hope for, and provide the technical service and support you expect. Our pricing is as competitive as our tools. Call today and find out what we can do for you."

"Powerful debugging and development for these processors:
8051
68HC11
Z80
68000
6502
Z180"

"ADC Package - C Compiler, Assembler, Simulator with WIDE 3 Windows IDE.

adx-z80demo.zip
adx-z180demo.zip
adx-z8000demo.zip
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ADX-Z80 Z80/EZ80 Assembler
ADX-Z180 Z180/64180 Assembler
ADX-Z8000 Assembler

In general, assembler demos have no code size limit and produce full listing, link map and symbol files, but no hex file output is generated. (the exception is the AVR assembler demo, which generates up to 1.5K words in the Extended Intel Hex output file) Also, they are not time limited.

Most C compiler demos have limits on the amount of assembly code that can be produced by the code generator and produce a encrypted hex files for use with the integrated Windows simulator debugger.