The Open Source Physics (OSP) Collection “provides curriculum resources that engage students in physics, computation, and computer modeling. Computational physics and computer modeling provide students with new ways to understand, describe, explain, and predict physical phenomena.” OSP was awarded the 2020 APS Excellence in Physics Education Award.
Stellarium Web is an online planetarium that can be set to your location. An excellent companion to real life stargazing, it has a variety of filters and settings, including constellation art, Azimuthal grid, and equatorial grid. It even tracks satellites! Stellarium is also available as a free app.
The Cornell Lab of Ornithology is the place to go for all things bird. There are free webinars, live web cams of birds all over the world, courses in bird identification, educational games, and of course the Merlin App, a free global bird guide with photos, sounds, maps, and more.