IXL offers thousands of online practice skills covering pre-K to algebra, with problems that adapt to a student's individual proficiency.
The only downfall is that you have to pay for it to do more than just one activity each day.
This site is a short cut to readings, it gives you a summary of a chapter in a book or cliff notes, study guides and more. It's helpful when you don't want to read the whole chapter of a book.
This page shows you California's requirements to become a teacher. This example specifically shows what you need in order to get your Multiple subject credential.
School Library Journal is an excellent source of high-quality articles on technology integration. In many districts, your librarians are your go-to ed tech resources on campus.
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Video in the classroom can also promote strong discussions, liven up a lesson, and can be downright fun.
I'm more familiar with TeachingChannel than Mission100percent, but both are excellent tools - especially for future teachers.
Screencastify is a video screen capture program that stores video in a special folder in Google Docs.
Snag It is also a Chrome app and extension that allows users to capture and manipulate still images from their screens, as well as capture video with narration.
Edpuzzle is a YouTube annotation tool for creating or editing YouTube videos by clipping the source, and adding narration, quiz questions and comments.
A great site with many different ideas on how to protect children on the internet, how to prevent cyberbullying, regulate on blogging, revealing to much personal information and social networking.
If you have to do phonics and low level reading activities, at least spruce them up with technology! I have actually seen young kids get really excited about this site.