Nice app, works on El Capitan, support web site definitely exists

I’ve used this app (purchased from the Mac App Store) for a number of years across versions of OS X without any problems. Very handy for quickly ejecting external drives when taking my MacBook Pro mobile. Free space alerts are very handy (nice for an early warning if a Time Machine drive is filling up). Highly recommended!

David Sheeks about FreeSpace, v1.2.15