Scoutlier is a warehouse for middle and high school students to share pictures, observations, measurements, or videos (either on the web or through iOS and Android apps).
826 Digital is aligned to the Common Core ELA standards but can also work for writing programs in states with their own standards.
Workbench is a PBL platform where students can complete STEAM tasks using everything from basic art supplies to technologies such as Sphero, Makey Makey, Raspberry Pi, and more.
Tinkercad is a free, kid-friendly online computer-aided design (CAD) program where users can design, modify, and print 3D objects.
The projects offer well-crafted tutorials, guides, and videos, which are tremendously easy to follow.