I know nandes KAFX.
It's a plugin for Avisynth, like VSFilter, but doesn't render an ASS file, instead it loads python code (which also loads an ASS file internally) to draw on video frames, not really comparable with AFX.
ASS (which NyuFX generates) has style tags and objects (texts or shapes), KAFX uses Cairo as graphic library to draw.
Both produce 2D effects and nearly same effects are possible, but i mean NyuFX is much user friendlier (just look the GUI, english documentation and examples).
From FAQ:
Quote:
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ASS as output format for effects was chosen, because it's easy editable afterwards, fast to produce and sometimes playable as softsub.
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If someone really wants to go so far, that ASS is not enough anymore, i wrote in past
FLuaG [1] to draw with OpenGL on video frames and additonally have access to audio data, so 3D effects, audio waves and much more is possible, but for anime karaoke that's
nonsense.