Below are portals for testing data transfer rates. Most portals below are ReadOnly. Longer descriptive text could guide users towards particular collections for specific things, if there's typically a collection most people will want to try first.
Anonymous read-only Globus test host in Washington, DC
Anonymous read-only Globus test host at Starlight in Chicago
Anonymous read-only Globus test host in Sunnyvale, CA
Anonymous read-only Globus test host in Denver, CO
Anonymous read-only Globus test host in Houston, TX
Anonymous read-only Globus test host at CERN
Authenticated Globus write-testing DTN in Washington DC