Act vs Pants

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.

Pants is Ergonomic build system for Python, Go, Java, and Scala with fine-grained caching and concurrent execution.. It is available under a free model. This tool falls under the developer utilities category.