Purdue Owl (website) This website does a nice job of quickly explaining the different purposes for writing and how it impacts the information and ways a writer communicates his or her ideas. It's a nice reference for students as they begin composing.
EquatIO (extension) This chrome extension allows students to create mathematical equations, formulas, and demonstrate their thinking processes either by handwriting (if digitally done) or typing. Not only can it be used in Maths, but also Sciences and Design.
Piktochart (website) Piktochart is a website that allows students to demonstrate their knowledge and understanding, communicating their ideas through infographics. It is intuitive to use and helps students understand different ways to organize ideas through visual representations.
Book Creator (website) Book creator is a way for students to create digital books online. It is simple to use and offer students another way of expressing their understanding and using their communication skills.
Make Beliefs Comix (website) This website is a fun and easy way for students to create comic strips illustrating larger concepts, issues, or conflicts graphically to express their understanding and ideas.
Graphic Organizers (strategy) Graphic Organizers offer students a way to graphically plan their thoughts before articulating them. The linked resource has a plethora of common graphic organizers you can download, or you can create your own for your needs.
Generate-Sort-Connect-Extend Concept Maps (routine) GSCE maps help not only let students graphically organize their ideas, but also understand how to categorize and prioritize them, make connections, and look for ways to extend their knowledge and claims.
Evidence Logs (strategy) Evidence logs are a strategy to use with students to help them understand how to collect and organize ideas, facts, examples, etc. as they are learning in a unit to be later used in a performance task. It also helps them plan for long term tasks by balancing the work in small doses.
Google Draw (website) Google Draw is a great resource for allowing students to create their own visual organizational tools and maps. They can apply what they have learned in class to create their own unique creation.
Foldables (strategy) Foldable notes or graphic organizers is a strategy to help students who are tactile and visual learners better understand concepts and organize their ideas in a new way to better remember them. The basic concepts of using foldables are explained in the PDF linked, and you can explore more variations of them online.