MAGE, also known as Memgraph Advanced Graph Extensions, is an open-source repository that contains graph algorithms in the form of query modules written by the team behind Memgraph and its users. You can find and contribute implementations of various algorithms in multiple programming languages, all runnable inside Memgraph.
Check out the MAGE documentation for a detailed overview of all the available modules and installation instructions.
MAGE Source code
Check out the MAGE source code on GitHub if you are interested in the underlying implementation.