Several cities have created labs that can be used by citizen scientists, and several organizations exist that coordinate and/or report on citizen science projects.
Organizations such as science centers or scholarly societies sometimes provide listings of citizen science projects on their websites.
The next GBBC is February 17-20, 2017. Bird watchers of all ages count birds to create a real-time snapshot of where birds are.
Scistarter and Zooniverse provide searchable listings of numerous citizen science projects throughout the world.
Several blogs provides reviews and commentary on the process of citizen science as well as specific citizen science projects.