" With the join.me viewer, you can join an online meeting no matter where you go. View someone’s screen, share ideas and collaborate in real time, for free!......"
2- Air Sketch
" Air Sketch is great for presentations in the boardroom, classroom, or on the go. Just fire up Air Sketch on the iPad and open the specified URL from any HTML-5 compatible browser on the local network. Your photos and drawings show up natively in the browser...."
3- Conference Pad
" Control a presentation on up to fifteen iPads, iPhones, and iPod Touches from your device, simultaneously and wirelessly over Bluetooth or Wi-Fi. Display it seamlessly on one or more external screens or projectors attached to iPads and iPhone 4s. ......"
4- Team Viewer
" TeamViewer allows users to : -On the fly support your family and friends - Have access to your own computer with all of its documents and installed applications- Copy files from your home pc to your iPad and vice versa....."
5- Screen Chomp
" A simple doodling board, markers, and one-click sharing tools make spreading your ideas and know-how easy and fun! ......."