The Adjective Detective is a fun online game I just found out about from Technology & Learning. This game explains what an adjective is and provides a lot of interactive exercises siting examples. Also, it has students being a detective and finding the adjectives (i.e. superlative and comparative) by highlighting them in a sentence w/ a magnifying glass. Finally, there is a short quiz to help reinforce learning.
Writer to Read is an amazing iPad app designed for kids 3-10 yrs to help w/ their Reading & Writing skills by creating a book. W/ that in mind it also makes it an ideal app for introducing digital storytelling to students that is aligned to Common Core Standards. The way this works is a child/student write's a sentence to the best of their ability and then an adult/teacher translates the sentence into proper text. This helps students learn visually as they see their sentenc
Penzu Classroom is wonderful new web 2.0 site that allows educators/students to create online journals and more. This is done in a safe environment where educators create a journal/class and then students join via unique code (similar to ClassDojo). Once a student has joined a class a educator can send assignments, instructions, comment on student's work, etc. This is a great way for educators to organize and track their students all in one place via the cloud. 
Quill is an excellent new site for working on proof reading skills such as punctuation and grammar that I just learned about from Richard Byrne's blog. This site allows students to login and correct Reading passages that teachers have selected. Best of all, Quill analyzes the results and shows students what they have gotten wrong w/ a walkthrough explaining the correct answer.
Hemingwayapp is a nifty little web tool that I just found out about from the amazing educator, Ozge Karaoglu. This is a nice site for students who want to improve their Writing skills. All a user has to do is copy/paste in some text and click edit and they will get a Readability score. The score will tell you how many paragraphs/words you have, how many hard to read sentences, suggestions on how to shorten or switch verbs around, etc etc.
Sumdog is an excellent iPad for educational games in Math, Reading, and Writing. Based on the popular website, Sumdog has student's playing against other student's worldwide to build their skills. The only requirement is signing up on their free website to be able to play the games on an iPad.
Gadzookery is a wonderful free iOS app that helps students build their Writing and Vocabulary skills. This can be done by either playing one player or against random opponents where a person tries to create a sentence from a given word. What makes this nice for educators is that the game comes w/ a built in dictionary/thesaurus to help kids create their sentences. Scoring is done by each letter and a person can challenge another person (to eliminate their opponent's score) for misspelled/made up words.
BoomWriter is a site/company I've worked w/ before has just released a number of lesson plans to help educators integrate BW into their curriculum. For those that don't know what BoomWriter is, it's a fascinating innovative educational tool that educators are using around the world to turn their students into published authors. This is all done in a safe environment built around an educational portal where teachers create and manage the student accounts. 
Tools 4 Students is an excellent iPad app designed to help students w/ their Writing/Comprehension. The way this works is T4S supplies 25 graphic organizers that focus on such skills as: cause/effect, main idea, KWL, etc, and can be edited/saved/shared to help students organize their thoughts and strengthen their skills.
Medium is a interesting new site designed to let users share their thoughts in a stunning way. I like to think of Medium as a social network that contains a bunch of visual blogs that users can search through. There are lots of educational possibilities too such as: digital storytelling, collaborative writing, and more.
