The ZX-81 Episode: A New Old Machine is Reborn, A Giggling Child, A Beige Beauty, Rampack Wobble and Cassette Loads, The Process of Booting, C64 Cassettes, The Keystrokes, Scroll Lock and F2, Everything Works, Thanks Aschmitz and Trumad, Screenshots and Zen, The Cup of Tea, Well Worth The Search. We added ZX-81 emulation to the archive, something that probably made no sense to do years ago, but why not. If you want to visit the collection as it stands:

https://archive.org/details/softwarelibrary_zx_81_games