Apps Related to Fully Customizable Interface

Ex Falso is a robust, free, and open-source cross-platform audio tag editor designed for meticulous music library management. It provides powerful tools for editing metadata across various audio formats, ensuring your collection is organized, searchable, and consistent.

Qmmp is a free and open-source audio player designed for various operating systems, known for its lightweight nature and extensive customization options through plugins. It provides a familiar interface similar to classic audio players while offering modern features like streaming, media conversion, and library management.

Quod Libet is a highly extensible GTK+-based audio player for Linux, focusing on powerful music library management and flexible tagging. Written in Python and using the Mutagen library, it offers extensive customization and handles diverse audio formats seamlessly.