http://www.freemindfulness.org/apps

[macandrui]

http://www.freemindfulness.org

The mind bell (first on the list) has been very helpful for me, as a reminder to be here now, instead of "there"

It's kind of like an antonym for a boxing ring or fire alarm bell ;-)

[Three Roses]

Thanks, macandrui!

[MarkD67]

Hey yes macandrui, I have been using it for over a year now and it still works wonderfully to bring me back to my breath. I occasionally change the frequency to get me out of starting to habitually ignore it. Also its a great way to introduce mindfulness to others.
Another good app is 'headspace'. It hs a subscription service, but i just keep using the free first 10. It is spoken, but short and effective.