Act vs Atlas

act is an open-source command-line tool that runs GitHub Actions workflows locally using Docker containers. It reads workflow files from .github/workflows/ and executes them with environment variables and filesystem configurations matching GitHub's hosted runners. The tool enables fast local feedback on workflow changes without requiring commits and pushes to a remote repository.

Atlas is an open-source database schema management tool that uses declarative schema definitions to plan and apply migrations. It supports MySQL, PostgreSQL, SQLite, and other databases with a modern approach to schema-as-code.