Freeware Student Intervention Program

Is anyone familiar with any sort of student intervention freeware program? My school is looking for a program that tracks/monitors student progress, particularly for math and reading. We are toying with the idea of offering a summer program. Since we have limited funds (go figure!) we are looking for a cheap solution.

The summer program would be designed for students who did not satisfy their grade level requirements, and thus, did not pass. In a sense, we would like a "summer school" that is taught through the computer using software/freeware specific to their grade level.

Any freeware solutions/recommendations that are specific to grades K-8 would be greatly appreciated.