TryEngineering Games
A variety of free games available. These games could all be integrated into a meaty unit where they could add a component of interest to motivate students to think about new things.  

Cardboard Challenge
Not everything needs high tech and expensive resources. A lot can be done with a cardboard box and a lot of imagination. Check out this amazing challenge from the Imagine Foundation. Take a moment to watch the video. You and your students will want to be involved with this amazing low tech, high engagement possibility.

SCRATCH is a programming language that lets you create your own interactive stories, animations, games, music and art. 

NASA Education
For some out-of-this-world learning, check out NASA Education resources. You will be amazed at the number of free downloadable guides on the site that contain high-quality projects to integrate into your classroom.

Wildlife on Webcam
The excitement of learning about animals is taken to a whole new level when students are able to watch and observe animals right from their classroom. Ideas include a unit on habitats, ecosystems, or even a creative writing project where students create a diary entry from the animal’s point of view. 

Discover information, examples, and tools related to incorporating aspects of the arts, design, and the humanities into STEM-based school activities.

Adobe Spark for Education
Adobe Spark is the perfect free educational tool to bring creativity into the classroom. Students can easily create reports, presentations, posters, and more.

Provides interactives, web features, activities, programs, and events for K-12. Saturday and Summer professional development workshops are available through the Teacher Institute.

Masterpieces to Math
A wonderful article that focuses on how to incorporate art in math. Learn how to use Art to teach fractions, decimals, and percent equivalents. You will look at Math in a whole new STEAMie way.

Smithsonian Everything Art
Explore, Discover, Learn: Art and culture, history and travel, science and nature-explore all theSmithsonian has to offer at Smithsonian Students