With Google Maps Engine you can create and share maps. Add information to the map by dropping points or drawing lines or shapes. Or, you can also add information by uploading a spreadsheet or Google Earth file (kml).
With an ArcGIS Online free account you can create and share web maps. Add data by drawing on the map ("Add map notes"), searching available datasets ("Search for layers"), or from a file. Accepted files include zipped shapefiles, delimited text files (csv or txt), and GPS exchange format (gpx).
"An easy-to-use gateway to historical maps in libraries around the world." - Search for scanned historical maps across numerous different collections via a geographical search by typing a place-name or clicking in the map window, and narrow by date. The search results provide a direct link to the map image on the website of the host institution.
Gateway to digital historical maps from library collections around the world. Search by place-name or by clicking on the map window, and narrow by date. Search results then provide a direct link to the image map on the website of the host institution. A collaboration between the Great Britain Historical GIS Project based at the University of Portsmouth, UK and Klokan Technologies GmbH, Switzerland.