Ukelele

Ukelele is a free, open-source tool for designing and modifying keyboard layouts on macOS. Ideal for multilingual users, programmers, or anyone needing tailored input methods, it offers a visual interface to drag-and-drop keys, assign Unicode characters, and adjust modifiers. Users can export layouts as .keylayout files compatible with modern Mac versions, including Ventura and Sonoma. It simplifies creating custom layouts for specific languages, symbols, or workflow needs, eliminating complex coding or paid third-party tools.