I found this online from Edutopia. While not utilizing technology, this activity is another great way to get the students writing and teaching grammar (parts of speech/parts of a sentence):
Postcard Puzzles - Cut a bunch of postcards and give one piece to each student. They have to find the matching students, put the puzzle together and write questions about the postcard that apply to what I (the teacher) may have done over the summer. Then, share with the class.
You could also adapt it by making the postcards pictures of characters from a story. Then, the students have to answer some questions about that character (an idea to teach characterization).