Eye Can Learn is a website offering students with visual problems eye exercises that can help students Visual Process Skills. Some of the areas that are covered are: Perception, Tracking, Focusing and Eye Teaming.
Khan Academy is like your very own digital tutor. This site has a ton of educational videos and interactive exercises (particularly in math) that cover skills that range through grades k-12. Students, teachers, and parents alike can learn an abundance of things from Khan Academy, and it's completely free.
Okay--this is not necessarily appropriate for students, but is valuable for educators who need to handle the demands of the work by acknowledging that sometimes, there is nothing you can do but just laugh. If you run across something worthy of notice among your own classes, you can immortalize your students' writing gems by submitting them to the blog. Educational applications? Well, there are some fine and entertaining mistakes which could provide fodder for exercises in editing, revision, etc. as well as discussion on the importance of choosing the right word. If you check out the site, you'll see what I mean. Enjoy!