SciMLBase
SciMLBase.jl is the core interface definition of the SciML ecosystem. It is a low dependency library made to be depended on by the downstream libraries to supply the common interface and allow for interexchange of mathematical problems.
This website serves as a package browsing tool for the Julia programming language. It works by aggregating various sources on Github to help you find your next package.
By analogy, Julia Packages operates much like PyPI, Ember Observer, and Ruby Toolbox do for their respective stacks.