What are the top Mojo repos?

Popular Mojo repositories on GitHub, each answered in plain English for non-coders: what it is, its tech stack, and how to run it.

modular/modularA platform for running AI models fast on your own servers, with MAX for high-speed inference across GPUs and C
bewaffnete/mojovecA vector database written entirely in the Mojo language for fast similarity search over AI embeddings, aiming