Garry Lancaster (in the UK) has been developing these sources for the Cambridge Z88. This is an almost fully ANS-compliant Z80 Forth with most extensions. See Z88 Camel_Forth for source code, documentation, etc.
Also, Karl Lunt (in Bothell, Washington) has since developed these sources for the Z180. This is a stand-alone Z180 Camel_Forth , suitable for embedded systems development.
For some background on Camel_Forth, and the original reasons for its creation, you can also read the series of articles about porting .Forth to new processors , Moving .Forth: a series on writing .Forth kernels .
CamelForth modified for the Rabbit_2000 -- download CAML104A.ZIP (27K) and check it out... (also includes SwiftForth source code for an uploader).
NEW: Executable Rabbit 2000 Uploader
Program for DOS (includes source code for Pygmy Forth v1.4);
-- it will upload any Intel HEX file from the DOS command line. Download
this utility and its Forth source code: R2000U.ZIP
(14K)