Zooniverse is described as 'The Zooniverse is home to the internet's largest, most popular and most successful citizen science projects. Our current projects are here but plenty more are on the way' and is an website in the Education & Reference category. There are eight alternatives to Zooniverse, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and Android. The best alternative is Foldit, which is free. Other great sites and apps similar to Zooniverse are Distributed Proofreaders (Free, Open Source), Quantum Moves (Free), Phylo (Free) and OSM Tasking Manager (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).
Distributed Proofreaders provides a web-based method to ease the conversion of Public Domain books into e-books. By dividing the workload into individual pages, many volunteers can work on a book at the same time, which significantly speeds up the creation process.
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.
OSM Tasking Manager is a mapping tool designed and built for the Humanitarian OSM Team collaborative mapping. The purpose of the tool is to divide up a mapping job into smaller tasks that can be completed rapidly.
The Cure is a serious, biology-based card game. Assemble the best hands and you can win - just like poker. The challenge with The Cure is that we don't know the rules yet! Until you play, we can't tell you if you have the equivalent of a royal flush or a pair of 2s.
Eyewire is a game to map the brain. Anyone can play and you need no scientific background. Hundreds of thousands of people from around the world already do. Together we are mapping the 3D structure of neurons and advancing our quest to understand ourselves.