BrainPop Jr. is a site that students have access to through a school subscription. You can access these videos through classlink.
Mobymax is a site our students have access to use through a school subscription. This site has math practice (including a separate section for fact fluency), numbers (which is great for building number sense), letters, reading, and so much more!
Code.org has coding lessons that were put together for elementary level students. It starts really easy and gets harder as students master different levels.
PebbleGo has some really great science resources that are fairly easy to find. Think of it sort of like a digital library that you can listen to.