This site has been around for a while but some of the activities are new to me. It offers some innovative ways to allow students to "show what they know." They can create a fake text, tweet, or Fakebook page to share information they have learned about a fictional character, historical figure, or concept. They can create timelines, label images, or create a newsflash.
The site also has game creators, timers, and QR code generators. Some of the activities on this site have advertisements so check those out and see how you feel about them.
Some Reviews of the Site
Richard Byrnes' Favorite tools at Classtools.net