IXL for Language Arts and Math
https://www.ixl.com/signin/fcsd

Sum Dog
https://www.sumdog.com/

Thinking Blocks  (math word problems using tape diagrams)
http://www.mathplayground.com/thinkingblocks.html

Xtra Math (fact practice)
https://xtramath.org/#/signin/classroom_other

Raz Kids (independent leveled reading and comprehension)
https://www.kidsa-z.com/main/OverviewDashboard/