The Preservation Project is a modification of Super Mario 64 made to look and feel like the Shoshinki 1995 demo, being built off the decompiled source code.
You can check mariovona's youtube.com user profile for updates!
Come check the Q&A with the devs!*
TPP Team Credits:
Fluvian
Marionova
Zucchino
Lurondor
CDi-Fails
*Warning: Q&A Isn't actually with the devs lol