Act vs Caddy

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.

Caddy is an open-source web server written in Go that features automatic HTTPS via Let's Encrypt, HTTP/2 and HTTP/3 support, and a simple Caddyfile configuration syntax. It is designed for ease of use with sensible defaults.