
Your eyes aren't deceiving you. That is, in fact, AviSynth+ running natively on a real iBook G3 under Tiger. Here's the proof:

There were always the occasional posts back then on Doom9 and elsewhere where people would wish for AviSynth to work on Linux or Mac (which was PPC at the time, of course). 15 years* isn't too late, right?
*Okay, a little over 15 ½ years: it's actually been possible since March. The PowerPC part is what's new here - that's still in a development branch.