Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps can include as source & avoid adding a dependency. Written in Java, usable from Groovy, Kotlin, Scala, etc.
Python CLI framework for tools AI agents can call safely: one-call manifest, JSON envelope on every exit, typed exit codes. Implements the CLI Agent Spec
A TypeScript-first, runtime-agnostic command-line toolkit for Deno, Node.js and Bun: featuring a command framework, argument parser, interactive prompts, tables, ANSI utilities, and more.