Act vs asdf

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.

asdf is an open-source CLI tool for managing multiple runtime versions of programming languages and tools. It provides a single interface to replace language-specific version managers like nvm, rbenv, and pyenv through a plugin system.