Publicopia
Publicopia publishes reference sites on subjects the government already documents but nobody has made usable. Each site takes an official dataset, cleans it, joins it to other public sources, and gives every record its own page. The data refreshes every night, and the cleaned tables are free to download under CC0.
Park Atlas
Every National Park System unit: fees, hours, alerts, campgrounds.
Wilderness Atlas
National wildlife refuges, wilderness areas, national forests and the BLM monuments, one page each.
Trailhead Atlas
Every named trail on National Forest land, with what is allowed on it and where it starts.
Campsite Atlas
Every public campground on federal land, with the ones that never take a reservation.
Register Atlas
Every place on the National Register of Historic Places.
Publicopia Labs
Small tools built with the same public data, from a dark sky map to forty-seven years of park visits.