Zeta is a comprehensive load-bearing library for Modular gameplay mods. It is built as a retooling of the original Quark module system and serves as a successor to AutoRegLib.
Documentation is not available yet, as it is not fully finished. Other mods will be able to use it soon, keep an eye on this space.
There is no need to download Zeta unless some other mod requires it, as it does not contain any content on its own.