In reply to G. Tiger, Esq.:
I really rate the Metolius Grip Saver, it's really been really helpful for me when I've tweaked a finger...
A hot/cold roll on finger sleeve, that was brilliant when I had an injury, much easier than faffing about with bowls of ice water.
Finger acupuncture rings are nice, seem to help loosen things up after a day of hard climbing.
Prohands Grip master is a nice little toy to play with whilst you're sitting at your desk at work...
Now, I have at some point used all of the above but very on/off and to be honest these are mostly just for when I've overdone things a bit. Which actually hasn't happened in a while because my fingers are feeling much stronger because I got a Beastmaker (or more to the point, started using the one I already had!).
You can start from a very low starting point and work your way up gently on a Beastmaker, and it will make your fingers genuinely stronger, and you'll see a difference in your climbing, none of the other bits and bobs I've mentioned will do that.