Advanced features such as tool tips, splitter windows, and dockable tool bars are available on all platforms and give developers unprecedented flexibility when designing portable user interfaces. Zinc is ideal for dynamic, data-driven user interfaces. Other products require that user interfaces be designed prior to run-time, then present themselves rather statically. Zinc applications may also present themselves dynamically. Motif provides the only consistent user interface for Unix-GUIs yet is C' based and notoriously difficult and finicky.
Developers targeting embedded operating systems have very few choices in development APIs.