K-12 tech tools with lots of helpful information (e.g., media release form). Many many tools categorized by content areas with search engine within. Looks like a very helpful tool for teachers and families. Recommended to me by a grad student.
On this free website, you enter text and it's reworded--might be worth an look. It indicates that it helps with vocabulary development and comprehension.
VocabGrabber is word cloud resource that allow you to enter text and then it automatically generates a thesaurus of word meanings. Looks interesting for helping students with difficult vocabulary.