Apps similar to Scroll the Volume include Volwheel, which is free and open source. Other options are Volume Scroller and Volume Scroll. In total there are three Volume Control Tools like Scroll the Volume for Mac, Windows and Linux.
VolWheel is a little application which lets you control the sound volume easily through a tray icon you can scroll on. It is written in Perl/Gtk2 and works both for ALSA and OSS. You can configure it quickly through its configuration interface.
Volume Scroller allows you to quickly change the system volume. All you have to do is hold the mouse pointer over the taskbar and turn the mouse wheel.
Volume Scroll lets you control your main volume by hovering with your mouse cursor over the top menubar and scrolling up or down to change your volume.
