Find the beat by tapping (9)

Tapping in rythm with the song is not a good solution if you have four thousand files in your collection, but it can be useful in some situations.

BeatsPerMinuteOnline.com

Free online tool. Tap any key to the beat.

Tap That

Is a free tempo detection app for iPhone designed to simply and elegantly get the job done.

Fine Metrone


It can show rounded and fractional tempo.
Free to try, $19.99 to buy (as of April '09).

AnalogX TapTempo

Freeware.

bpmWidget


A widget for your Mac OS Dashboard.
A tap-tempo device useful for estimating the BPM of music and setting the BPM meta-tags of the current track in iTunes.
Freeware.

iTunes BPM inspector

Freeware.

MuseBook Metronome

Shareware

Manual tapping

BpmChecker

Shareware

Manual tapping

"Tap for beats per minute"

Web site with tap-key mini application.