https://www.raz-plus.com/ (students have a login from me that they should know)
https://www.myon.com/login/index.html (I will send instructions for this)
http://www.starfall.com/ (start hitting those vowel pairs for second grade)
In second grade students will be expected to have math fluency (AKA timed math fact test). They will begin practicing this but you can grab (or make) flashcards (sums to 20) for them to practice their facts. This is helpful for regrouping in addition/subtraction and multiplication that is to come.
Put down the electronics and do activities that will create memories and experiences for your children to draw from.