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The i-clicker system is widely used in colleges, and is great for assessment. There's also an app companion for it.

A great website that can be used to let students see what is marked as "plagiarized" in their submitted works. This builds informational literacy, as they get used to paying attention to citations and information that is actually backed up with sources.

A good tool to use that puts an interesting spin on study guides. The site isn't as important as the concept: hide study material in the form of a game of some sort! This site allows you to create sudoku puzzles.

I highly recommend this site to anyone who has the capabilities to use it. Very useful for teacher-student and teacher-parent communication.

You can easily make a subreddit for your specific class, allowing discussions, helpful links, and really anything to be shared between members of the class!