There are 2 repositories under subcommands topic.
Modular visual interface for GDB in Python
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.
cmd2 - quickly build feature-rich and user-friendly interactive command line applications in Python
A command line interface for audible package. With the cli you can download your Audible books, cover, chapter files.
Faster, easier, more declarative parsing of command line arguments in Objective-C/Foundation.
args-parser is a small C++ header-only library for parsing command line arguments.
Command Line Tool for managing Flutter projects
Keep track of all your git repositories.
Writing command line apps made easy
Simple subcommand CLIs with argparse
Simple Sub-Commands for Go using flag package - can be used via copy/paste too, because it's small.
⚠️DEPRECATED⚠️ Beautifully handle subcommands on your SwiftPM command line tool
C# library that helps developers build user-friendly command-line interfaces (CLIs) with nested subcommands and features like intuitive navigation, clear documentation, and actionable error messages. It also supports asynchronous command execution and customizable dependency injection. It is suitable for building CLIs of any size or complexity.
📦 Command handler for discord.js v14 subcommands and subcommand groups
Easy subcommand handling for a golang based command-line application