Here's a free, tiny program for PC or Mac that will let you find out the beat of any song you happen to be listening to, by duplicating the "tap BPM" function of nearly all DJ software.
Unsurprisingly called "Tap BPM", it is simplicity itself - you open the program and tap any key as you're listening along to your music, and it reports the BPM back at you.
There's even a web version you can bookmark in your browser and just go to whenever you want it.
It could be useful if you're trying to train yourself to guess BPMs, or if you just need to know the BPM quickly of a song that's not yet been analysed in your DJ software.
Anyway, it's a no-brainer because it's free. Get it from here: Drumbot website.
What's your favourite free DJ or music app? Let us know in the comments.