VirtualDubMod
From Avisynth wiki
VirtualDubMod is a unification of several popular modifications of the famous video editing software VirtualDub by Avery Lee.
VirtualDubMod contains many great enhancements for AviSynth. It can generate simple scripts for opening many files directly. It has an advanced editor, with syntax highlighting and help. Easy updating, by reloading scripts at a keypress. A must have for any serious avisynther.
It also enables you to serve YV12 data in Fast recompress mode, which is not available in VirtualDub.
The homepage is at:
http://virtualdubmod.sourceforge.net/
The project page can be found at: