I have done a quick’n dirty comparision between metrocenter and punyInform. my very provisional impression is that metro84 is good for porting old inform works (a boon for people with I5.x WIP still around…) and puny is good for new works. Together gives new life to the Z machine 3.
(IMVHO, Inform 5.x isn’t to be considered obsolete…)
Reply to myself, but I think I can be excused, because AFAICT at least a fragment of actual Infocom ZIP interpreter indeed was floating around (it’s the terminal routine for CP/M machines, whose back then was often distribuited as overlay source code because of the huge variety of terminals in the CP/M world):
I recently tried out Raspberry Pi Desktop for ScottKit and Inform compilers on Asus eee PC. Looks good. 512 MB RAM, 4 GB SSD. I run it on 32 GB USB Flashdrive. Really slow booting at 6 minutes, but it works.