FastFig is a website for math teachers and students. The idea is predictive math text. As users create problems the software will provide the answer for the user. You can currently use it for free and by examining the website there is a plan for requiring payment to use it in the future it appears. Through an exhaustive search of the site I was unable to find what prices will be. Users can choose between a blank page or working in algebra, trigonometry, engineering, and even word problems. There are various calculator functions based on the type of mathematics users will be completing.
I was pretty good in math. But I am sure that math teachers would have a better understanding of how FastFig works. There is a great tutorial at the beginning and also a search that helps find functions to use with the service. I also worry about its use by students to solve problems instead of trying to solve them on their own. At the same time, it is important that teachers know about these types of sites and that students might use them.