Folding@home is described as 'distributed computing project -- people from throughout the world download and run software to band together to make one of the largest supercomputers in the world. Every computer takes the project closer to our goals' and is an app in the Education & Reference category. There are more than 10 alternatives to Folding@home for a variety of platforms, including Linux, Online / Web-based, Mac, Windows and Self-Hosted solutions. The best alternative is BOINC, which is both free and Open Source. Other great apps like Folding@home are Apache Mesos (Free, Open Source), Foldit (Free), Charity Engine (Free, Open Source) and EteRNA (Free, Open Source).
Foldit is an experimental video game about protein folding, developed as a collaboration between the University of Washington's departments of Computer Science and Engineering and Biochemistry (many of the same people who created Rosetta@home).
Eterna is a citizen science game where players learn to design RNA molecules for medical research by solving puzzles. Complete these puzzles to unlock lab access and participate in challenges where you can invent medicine!.
Quantum Moves, part of the scienceathome.org umbrella concept, was born out of the dilemmas and questions the physics researchers at Aarhus University confronted with when they took the challenge of building a quantum computer in the basement lab of the university.