trackers

• frequency: Counts the number of times some value has been 'seen'
  Forms, frequency
• rate: Counts the rate at which an event happens
• /pointer/scale: pinch-to-zoom gesture
  Points tracker, pointer events, gesture
• point-tracker
  Point tracker

playgrounds

• point-tracker

moving average

• pointer: Average x & y
  moving average, pointer events
• audio: Average microphone input
  moving average, audio

pool

• key: Uses a resource pool to associate a HTML element per keypress
  pool, key events