Plants of the World is an incredible global resource of plant taxonomic data, imagery, and information. It is one of the best referential databases for plant species globally, developed by the Royal Botanic Gardens, Kew.
iNaturalist is a US-based, 501(c)3 nonprofit organization. The tool is largely considered to be a social network-based resource that uses technology to “share biodiversity information to help each other learn about nature.”
The feather atlas is an exceptional database of feather imagery, dedicated to identifying and studying flight feathers of the birds of North America.
A New England regional online database of 3,500+ plant taxa, including three searchable keys to help you identify your specimens.