RAZ-Kids is an engaging way to increase your child's reading time. In addition, it provides practice with decoding, fluency, and comprehension skills.
Arranged by grade level, this site contains a great set of computer based activities for grades K-5th.
This well-known site contains a number of activities for learning ABCs, reading, online stories, and more.
Lexia help students work independently to develop fundamental reading skills in a structured, sequential manner.
Reading Rockets - Best Literacy Apps
The Wilson Reading System directly and systematically teaches students how to fluently and accurately decode. The instruction is interactive and multi-sensory. Students learn to encode (spell) as they learn to decode.