We have just published Release 3 of Ozmoo, the free Z-code/Infocom interpreter for the C64. Compared to Release 2, which came out in June 2019, this release has:
Darkmode - a secondary, configurable, colour scheme (Player hits F1 key to toggle).
A configurable splash screen just before the game starts.
Support for four new languages. Apart from English, Ozmoo now supports Italian, Danish, Spanish, French, German and Swedish.
For more details, read the release notes at https://github.com/johanberntsson/ozmoo/releases
There is a full presentation of the project on the homepage at https://github.com/johanberntsson/ozmoo
The easiest way to use Ozmoo to build games for playing on a C64 or emulator is by going to Ozmoo Online: http://microheaven.com/ozmooonline/ . This web page has received many enhancements as well.