INaturalist
iNaturalist works by crowdsourcing, by asking many, many people to work on the project.  Some of the people who send information to iNaturalist are professional scientists and some are citizen scientists, ordinary people who want to help scientific projects.  iNaturalist sends information to International Union for the Conservation of Nature and other projects that watch endangered animals and other populations. iNaturalist users can help park rangers and other people who work in forests find and identify invasive species, for example kudzu.  According to one park ranger from the Great Smoky Mountains National Park in the United States, rangers usually already know an invasive plant is in their park, but iNaturalist and programs like it help them find out exactly where it is.  Then they can gather people to remove it.