Nuance
An uneducated try to resurrect and modernize the Nuance NUON emulator
Unfortunately the author of the original project (Mike Perry) passed away a long time ago, but it seems like nobody picked up this piece of history and so there is no NUON emulator to be found anywhere except for his Nuance 0.5.1 release from 2007.
The source code of 0.5.0 (or is it actually 0.5.1??) was later-on released by his family via http://www.dragonshadow.com/-/downloads/NuanceExperimental.zip
By now, emulation was improved a lot with many games now working almost correctly...