SMPlayer is a cross-platform graphical front-end for MPlayer and forks of Mplayer using GUI widgets offered by Qt.
License: Open Source
SMPlayer is an open-source media player that is lightweight and supports a wide range of formats, making it ideal for users who prefer customization and flexibility. In contrast, RealPlayer offers a more user-friendly experience with streaming capabilities and a built-in media library, though it is heavier on system resources and not open source.