Many schools and teachers post a list of recommended websites for learning games for their students. Here's a curated list of educational and engaging learning games for schools to post on their website and send out to teachers. Obviously, it can be adjusted by the teacher's or school's focus and their types of students.
Spelling Games
Phonics Games
Syllables and Segmenting Games
Analogies
Writing Lessons and Activities
Typing/Keyboarding Games
Vocabulary Games
http://www.spellingcity.com/spelling-games-vocabulary-games.html
http://www.learninggamesforkids.com/vocabulary_games.html
http://www.spellingcity.com/Games/matchit.html
http://www.vocabulary.co.il/english-language-games/
http://www.vocabulary.co.il/context-and-definitions/
Brain Training Games
http://www.learninggamesforkids.com/miscellaneous_games.html
Bookmarking Sites
Symbaloo's Visual Bookmarking has some great webmixes!
http://www.symbaloo.com/mix/wordgames2