For now this area will focus on GeoGebra and not on Geometer's Sketchpad.
While my first love is GSP, it has not kept up with the times. GeoGebra is currently the superior product mostly because it has many entry points for teachers and students. GeoGebra can be accessed by a mobile device (phone/tablet) through the app format or the web format and GeoGebra can be also used on a computer through a desktop version or the web version. These options and the fact that it is FREE. Which makes it very appealiing. In the materials there are a number of technology activities and they are all currently done with GeoGebra.
Watch this video to see some of the various activities that can be done using technology that liven up the curriculum and deeply engage students in the learning process.