ReadWriteThink has activities designed from grades K-12. You can sort the activities based on what grade level you are looking for. It has activities such as word sorts, venn diagrams, poetry helpers, and many more literacy activities to be used whole class on an interactive whiteboard or individually.
BrainPop Jr. is in the BrainPop family of websites. It features educational videos on a wide variety of topics, from health to math and literacy. Students love watching the videos, and then it includes followup activities, such as quizzes, games, and even jokes. It requires a subscription for some videos, but others are free.