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A good overview of the different types of multimedia, online, and software tools that are gaining popularity in math classrooms

GNU TeXmacs is a free wysiwyw (what you see is what you want) editing platform with special features for scientists. The software aims to provide a unified and user friendly framework for editing structured documents with different types of content (text, graphics, mathematics, interactive content, etc.). The rendering engine uses high-quality typesetting algorithms so as to produce professionally looking documents, which can either be printed out or presented from a laptop. The software includes a text editor with support for mathematical formulas, a small technical picture editor and a tool for making presentations from a laptop. Moreover, TeXmacs can be used as an interface for many external systems for computer algebra, numerical analysis, statistics, etc. New presentation styles can be written by the user and new features can be added to the editor using the Scheme extension language. A native spreadsheet and tools for collaborative authoring are planned for later.

"Illustrative Mathematics provides guidance to states, assessment consortia, testing companies, and curriculum developers by illustrating the range and types of mathematical work that students experience in a faithful implementation of the Common Core State Standards, and by publishing other tools that support implementation of the standards."

Scratch is a free programming app (it's already on your computer and all the kids) that comes from MIT (scratch.mit.edu) that would be a great teaching tool in math.  Larry, I mentioned this to you a while ago, but here it is!

This is going to be an amazing tool! Use engaging videos to create customized lessons. You can use, tweak, or completely redo any lesson featured on TED-Ed, or create lessons from scratch based on any video from YouTube. Watch the video to learn how.

An interesting take on Khan Academy...  a reminder that no particular tech tool or resource should be viewed as a "silver bullet' 

Free math graphing tool Desmos released Polygraph, a collection of four new classroom activities focused on a game involving lines, parabolas, rational functions and hexagons. It works like Guess Who, where one partner picks a graph and another asks yes/no questions to figure out what the graph is!

A great tool that puts an overlay on graphs, so you can manipulate data and make adjustments Jeff found using Geobra

just an interesting article

Really cool new google lab feature "Correlate"  There is so much to look at here.  Try out the Drawing feature...pretty cool. Draw an interesting curve, then click 'Correlate!' to find query terms whose popularity over time matches the shape you drew.