Math Apps and Tools
Khan Academy is a series of helpful videos and lessons that can be searched by topic.
Stat Trek is a site with helpful lessons and practice with regard to statistics.
Online Calculator Links
Desmos. An amazing online calculator and mathematical art producer.
TI updates. Download programs and updates to your TI-84
iPhone and iPad apps
Wolfram Alpha, interactive app and search engine. This is what Siri uses to answer math questions.
Texas Instruments app for iPhone and iPad