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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.

Idiomatic Go input parsing with subcommands, positional values, and flags at any position. No required project or package layout and no external dependencies.

"CLI Mate" autogenerates CLIs from structs / functions (nested subcommands, global / local flags, help generation, typo suggestions, shell completion etc.)