CanvaCanva lets you create really stunning graphics, posters, images, infographics, etc with ease. It also allows for collaboration, so students can work together. It's been around a while, but if you haven't tried it, give it a shot!
NewseumEDBrought to you by the Newseum in Washington, D.C., this website is FULL of primary sources, artifacts, and collections centered on topics such as freedom of speech, women's suffrage, media literacy and so much more. LOTS of great stuff here especially for history/social studies classes.
WebjetsThis tool is similar to Padlet, but is a little more flexible. Create boards where you can store and organize all kinds of stuff: videos, pictures, and articles. Could be used as idea boards or create class boards for discussions.
ProWritingAidThis tool is revolutionary for writing. Not only does it provide a spelling and grammar checker, it gives feedback on diction, style, sentence length, passive voice and SO much more. It's amazing how much you get for free with this tool.