The Internet is full of free and open educational resources, from courses to academic journals, and with so many education providers getting in on the movement to offer free educational content online, there's likely to be even more in the future. Yale, Stanford, MIT, and Berkeley are just a few of the high-profile universities that share some of their best courses with the world for the low, low price of zero dollars. While there are a lot of great resources out there, there are some online education resources that truly stand out as inspiring, for their vast collections, unique perks, and incredibly supportive organizations. We've picked out 15 open education resources that we find to be the most impressive and inspiring out there, and we encourage you to take advantage of what they have to offer.

Data visualization and infographic designs featured on the CoolInfographics.com blog in 2011

CloudOn is a "free for a limited time" app that allows you to create, edit, and view Microsoft Word, Excel, and Powerpoint files on your iPad. CloudOn pulls the files from your Dropbox account, and also automatically saves them there, so you must have a Dropbox account to use CloudOn

Reminder Guru is a free service that you can use to have reminders sent to you through email, text message, or phone call. Creating reminders in Reminder Guru is very quick and easy. After you have registered on the service, simply fill in the reminder form with a message for yourself, choose a reminder date, then specify how you want the reminder delivered to you. If there are tasks that you need to be reminded of daily, weekly, or monthly, you can set reminders to automatically repeat at the same time every day or week.