These resources provide free access to maps, map data, and research data from geology-related disciplines. You may also deposit your research data into some of them.
OpenBUBoston University's institutional repository housing scholarly works, research data, university publications and more
Earth ExplorerEarth Explorer allows you to search for digital elevation, Landsat, LiDAR, MODIS, Radar and more earth science data from the USGS and NASA. Registering for a free account is required if you wish to download data.