Smol Machines is a project that aims to provide a lightweight, portable, and self-contained virtual machine with subsecond cold start times. It allows users to manage and run custom Linux virtual machines locally with elastic memory usage and cross-platform support. The project provides a CLI tool for creating, running, and managing virtual machines, as well as a Smolfile for declaring environments. Smol Machines is designed to be a replacement for Docker containers, with a focus on simplicity and ease of use.