Personally I have written my own software using the Free API available from Betfair.

Definitely worthwhile and there are enough tutorials around to teach yourself.

I am only using it for collecting data at the moment. It took me around 3 hours to write a program from scratch to constantly download the prices of the next horse race when there is only 1 min to go.

It also allows you to code in your own test criteria and see what would happen in real time without actually having to put on any money.

Anyway Good Luck.