My favorite is on the ReadWriteThink website. There are several interactive organizers like shape poems, character trading cards, and basic maps like the K-W-L creator. Students do not need a log in so they can go directly to the link and create the map. When they are finished they can print. I see this being a very helpful link for moving into Common Core Curriculum where students can interact with different texts.
One of the others that I liked was Holt Interactive Graphic Organizers. These look like worksheets that you can click and print, however students can type information into the maps online then print.
I hope you find these sites helpful!