The A2kit version 4 has been released. A2kit is an open source, script-able command line interface for disk image and language manipulations, and the engine behind a number of editor extensions for Apple II languages. A2Kit version 4 features the ability to define, create, and manipulate your own track formats and nibble tables (but bring your own DOS when it comes time to boot!). A2kit is 100% safe rust, works on any major operating system, provides CLI help and shell completions, and is available as a stand-alone pre-built binary or via the cargo package manager. The repository for the A2kit 4 is on GitHub at https://github.com/dfgordon/a2kit along with links to documentation.