CodeCampus is a learning-first Linux OS for CSE and IT students
Benchmark for 50 000 000 prime numbers as single and multicore
a free cross platform checksum utility, supports 58+ hash algorithms
a free cross platform precise unit converter, supports 6000+ units
SJCE - free portable cross-platform graphical chess game, 100% Java.
Acts like a real library with the best user interface on the backpack.
I believe it is the best tool for everone get it it's free.