For those interested in having simple way to physically show numbers from 1 to 50, there is an Online Abacus. 
For those who like to throw a few darts around but are frustrated by the Math involved in it, there is a totally free online Darts Calculator.
“This advanced Dart Calc has been updated - and will also work out your darts finishing! Is this the BEST online Dart Calculator on the internet? We think so :-) Check out our Darts Calculator. It’s easy to use, free, and you can use it full screen.” http://www.online-calculator.com/darts-calculator/
