Thisreadingmama.com has word study apps that go over skills for preK- 2nd grade
-letter sounds (beginning/ending
-blends
-digraphs
-CVC words
-CCVC/CVCC words
-bossy r words
-CVCe words
-Long vowel teams
-Other long vowel patterns (igh)
-Dipthongs
Her site is awesome and has so much more and some items are even free.
Check it out and I am sure you might find something useful.