This is a page dedicated to recording useful spatial data resources.
Nothing too exciting just a bunch of links, but maybe you will discover something new. This page will be updated as I find new sources.
The US Forest Service Data Clearing House: http://data.fs.usda.gov/geodata/
The US Geological National Map: http://viewer.nationalmap.gov/launch/
Natural Earth has a lot of great layers: http://www.naturalearthdata.com/
Global climate data including cyclone tracks: https://www.ncdc.noaa.gov/ibtracs/
European tree species range maps: http://forest.jrc.ec.europa.eu/european-atlas-of-forest-tree-species/atlas-data-and-metadata/
North American tree species range maps: www.fs.fed.us/nrs/atlas/littlefia/species_table.html
Great R resources page not all spatial but R's spatial capabilities keep getting better: https://paulvanderlaken.com/2017/08/10/r-resources-cheatsheets-tutorials-books/