Not all citizen science projects are registered with Zooniverse. The American Gut project (americangut.org) is a great example of a crowd-sourced, citizen science project run out of a lab at the University of California, San Diego, that is studying the human microbiome. According to their website, the project has raised nearly $1.4 million in 4 years, with >9000 contributors as of April 2017. Individuals pay to get their samples processed and receive information about their microbiome, while providing the researchers with samples for the on-going science.
