Savvas:

https://sso.rumba.pk12ls.com/sso/login?profile=realize&k12int=true&service=https%3A%2F%2Fwww.savvasrealize.com%2Fcommunity%2Fj_spring_cas_security_check

Epic:

https://www.getepic.com/

Freckle:

https://freckle.com/en-us/

Nearpod:

https://nearpod.com/library/