Project OutFox supports all NoteSkins that are compatible with 5.0 and 5.1 (excluding 5.2).
To install them, extract their folders to Appearance/NoteSkins/dance
in your installation directory, or your profile folder.
Want to see your NoteSkin there? Check out this post!
Project OutFox is an extensible rhythm game engine based on StepMania, featuring 18 different modes simulating different dance, instrument, and key-based rhythm games.
Its goal is to create a cross-platform “sandbox” and “museum” for the genre, supporting over 20 years worth of content across a variety of formats.
Project OutFox 0.4.18.1 LTS