Cool Tools to Liven Up The Classroom

I just read an article in T&D Magazine titled "Beef Up Your Training Toolbox with Web Tool." The author, Mary E. Green, offered suggestions for how you can use web tools to increase engagement in the traditional classroom. The article inspired me to look at what is on my Cloud Apps page that may also be helpful to the classroom trainer. Here is what I pulled from the page that I think would be great to use in the traditional classroom. Plus, they are all free.

Cartoons (also suggested by Green) - A funny cartoon can liven up the class. The following allow you to make your own that you can use in the classroom.
DoInk
ToonDoo

Charts, Diagrams, and Data - Explain it in a chart using the apps below. Plus, you will be surprised how much supporting information you may find in the Google Public Data Explorer.
Cacoo (create diagrams)
ChartGo (create charts)
Google Public Data Explorer (Create charts and visualizations form public data)

QR Code Generators - Put QR codes in your manuals and on the classroom screen. They can contain text or URLs and is a great way to get additional information and resources to attendees with smart phones.
Kaywa
Snap.vu
YouScan.me

Screencasts - Software trainers, show them how it is done in a screencast that can be shared in the classroom and also accessed later at their convenience. Heck, give them the screencast's link via a QR code while you are at it. Participants can create their own and use them to share their new skills with others.
Screen-o-Matic
Screenr

Social Bookmarking - Make sure they have all your online resources by giving them one link to all your bookmarks. Plus, when you add additional resources at a later time, they will see them too.
Delicious
Digg
Diigo
Linkpad.me

Social Media - Get a back channel going in the classroom and keep it posted on the screen. Plus, what a great way to continue supporting learners by interacting via social media after the class ends.
Twitter
Yammer
Storify (create stories using social media)

Video - Create your own video and post it, find relevant videos already out there, and/or get your learners to make and share their own video.
TeacherTube
YouTube

These are just the apps I pulled from the Cloud App page. Do you have suggestions of where classroom trainers can find useful online tools for the classroom? If so, feel free to add them to the comment section.