I'm experimenting with "ArcGIS" thanks to Nick Hod's Beta version of "AeroScenery" which is proving in some locations to be better than Bing or GE BUT nothing is 100%
I set up a FREE account along time back.
Terms and Conditions of Using "ArcGIS"
This is the IMPORTANT part lifted from their web site Q&A:
Can I use ArcGIS Online free?
Yes, if it is for noncommercial use. With a free public account, you can create, store, and manage maps, scenes, and configurable apps, and share them with others. You also get access to content shared by Esri and GIS users around the world.
Regards to all,