feh is a fast, lightweight image viewer that uses imlib2. It is command line-driven and supports multiple images through slideshows, thumbnail browsing or multiple windows, and montages or index prints using TrueType fonts to display file information. Advanced features include fast dynamic zooming, progressive loading, loading via HTTP (with reload support for watching webcams), recursive file opening (slideshow of a directory hierarchy), and mouse wheel and keyboard control.
fillrio.sh is a standalone shell script that loads random MP3 files to all available memory in your rio. The RIO utility is required to interface with the RIO hardware. Special features of this tool include the ability to recursively scan your music archive directories, specify search strings and add to what's already loaded.