Back in fall last year, I asked our software team to come up with a system to log and then view all input, output, and any other useful data from the robot. The main driver for this was to be able to answer the age old question of "What just happened???" when something just isn't working properly or as expected in a match.
The result of that - WildLog - is a very useful tool indeed. We have written up a
post about it on our blog, so you can read why we did this and what it does, but here's a screenshot of the viewer showing our lift in action.

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FRC Team 111 - WildStang (Mentor, Drive Coach)
FTC Team 7458 - Full Force! (Mentor, Coach)
FRC Team 3132 - Australia's FIRST FRC Team! (Holy crazy first year, Batman!)