AvsP is at its core a tabbed text editor with features specific for creating AviSynth scripts. It is a unique application that has text editing features such as AviSynth-specific syntax highlighting and autocompletion to simplify the task of writing scripts. However, its primary advantage over other editors is its integrated video preview, which remains attached to the main window at all times.

AvsP doesnТ‘t require program installation, doesnТ‘t write to the registry, and doesnТ‘t require installing any additional framework. To run the program, simply unzip it to a directory of your choosing and double-click AvsP.exe.

Ссылка: http://avisynth..sP_v1.4.0.zip