The citizen-science platform began with a single project, Galaxy Zoo, in 2007; it now hosts projects from all disciplines, from classification of whale calls to the transcription of old ship logs.
The general-audience science magazine maintains a detailed project listing for various disciplines, from evolution to space.
The Berkeley Open Infrastructure for Network Computing allows citizen scientists to donate idle computer time to projects ranging from protein-folding to the search for extraterrestrial intelligence.
http://www.crowdcurio.com/ (launches early 2014)
A general crowdsourcing platform for citizen science; the three inaugural projects will draw from botany, medieval history, and organic chemistry.
Classify telescope images of galaxies by shape. Hosted by Zooniverse.
Compete to find stable structures for medically relevant proteins.
Design molecules of RNA, a molecular cousin of DNA.
Compare DNA sequences to help determine the tree of life.
Analyze images to map connections in the human brain.
ECOLOGY AND ENVIRONMENT
Track backyard flora and fauna to contribute data on climate change.
Learn to collect and analyze your own environmental data.
Analyze microscope images of tumor samples. Hosted by Zooniverse.
Personal Genome Project
Donate your genome and health data to scientific research.
American Gut Project
Donate samples of the bacteria living in your gut.
Valley of the Khans
Analyze satellite images to search for the tomb of Genghis Khan.
http://www.curarium.com/ (launches 2014)
View and analyze digitized museum collections from around the world.
Help digitize ancient Greek and Latin papyri manuscripts. Hosted by Zooniverse.
Test My Brain
Take behavioral-psychology tests and receive personal feedback.
Games With Words
Participate in experiments on the nature of language, with performance feedback.
Lab in the Wild
Contribute to research on cultural variance in design aesthetics.
Assess unconscious biases and perceptions.