"Yeah, yeah, just a minute - I'm about to beat my top score in Flappy Bird!"
The first of these programs was described in this article, "Need to train your rat? There is an App for that: A touchscreen behavioral evaluation system" and this is an app freely available in the Apple store which allows researchers (or the general public) to create flexible behavioral experiments on a very tight budget. One of it's advantages is also that it doesn't require a great amount of coding knowledge either so it shouldn't be that hard to set up.
The second article, "ArduiPod Box: A low-cost and open-source Skinner box using an iPod Touch and an Arduino microcontroller" describes the equipment needed to build your own Skinner box, complete with the open-source program to run it. All up, you can supposedly build a functioning operant chamber for less than $300 (US, I assume).
Here's a demonstration of it:
Even if you aren't interested in becoming a mad scientist yourself and running the neighbourhood animals through complicated behavioral experiments just to serve your own maniacal curiosity, you have to admit, seeing a rat using an ipad is pretty cool.