McCasland Maps and Spatial Data: ArcGIS Online
You can access OSU's ArcGIS Online at https://osu-geog.maps.arcgis.com.
At the login screen, click “Login using your O-key”. Use your OSU email and password and you will be all set.
You will initially be limited to 250 credits. If you anticipate needing more, contact Kevin Dyke (email@example.com).