Chegg is fantastic sites for students as it has a ton of useful resources for college aged students. This is a great place for students to explore courses, find homework help, and buy/sell/rent textbooks. All a student has to do is get a quote, ship the books for free, and then await payment when the book is received.
Hakitzu Elite: Roboto Hackers is a fun iOS game that I just found out about from Edshelf. In this game players battle robots against others while learning how to program them w/ JavaScript. As a player gets better in coding they are able to unlock extra items such as levels and more.
Math vs Undead is a fun educational iOS app that combines what kids love zombie, w/ Math. This is a great game for practicing basic Math skills such as: addition, subtraction, multiplication, and more. Ideally this game is for 3rd - 8th graders and has students trying to stop zombies by solving Math equations.
My Geometric Universe is a cool iOS app for helping students draw geometric shapes. This works by supplying a bunch of drawing tools such as: pencil, ruler, compass, etc etc. Once a shape is created it can then integrated into one of three digital environments: kids room, Middle Ages, or Ancient Egypt.
Phrasalstein is a free iPad app after my own heart. This app designed by Cambridge University Press, is a fantastic app that helps students learn vocabulary and phrases in a fun mid-evil/horror setting. The way this works is a user selects a verb and a preposition and then watch as an animation occurs. Also, there are definitions, examples, and exercises that students can complete to help reinforce their Language Arts skills.
Quizsocket is a nifty little site that I just found out about from Free Technology 4 Teachers. This site is designed for educators to assess students in real-time by having them login to a site (teacher generated code) on any device and then answering questions. A teacher can give these multiple choice quizzes either orally or on a board and then have students answer on their code specified Quizsocket page. One item to note, is that a quiz can not be created on Quizsocket it is only used for gathering answers and assessing students in real-time.
Otter is a neat little site that I just found out about from Free Technology 4 Teachers for creating a teacher webspace/page to host information for students. This site allows educators to create a space where they can create events, add them to calendar, share announcements, and upload files/homework. While it might not be as robust as other sites like Weebly or Wix, it does create a nice place to create an online syllabus.