This online communication tool requires no log-in or password for students, but you may choose to set up a class account to collect student projects. With Voki, students create a person, animal, fantasy character or any number of selections from the gallery, add audio via mic, text or call-in, a background from Voki's selections or one uploaded by the student (say, one that corresponds to a story being read in class), and whatever bling makes this Voki unique to the student. Once the Voki avatar is completed, it can be added to blogs, wikis, websites via a static image or an embed to keep it's interactive characteristics.
The website also offers lesson plans to spark your imagination. Here are some I've used:
have a Voki be a character in a book to discuss the story. Each student can create a Voki until all characters are covered. Then, add them to an online class page on that book.
have a Voki introduce the student's web page or blog.
have the Voki reinforce a unit on online privacy