Dom Morris recently made the source code available for a number of his z88 ports from the spectrum including Jet Set Willy, Lemmings and Sir Lancelot.
These can be compiled using z88DK which is great news.
Z88Chess, another spectrum port is also available and I've included it here for completeness.
I think its great to see these available and I'm sure they could be of interest.
https://github.com/suborb/lemmings_z88
https://github.com/suborb/jsw_z88
https://github.com/suborb/sirlancelot_z88
https://gitlab.com/z88/z88chess
https://gitlab.com/z88