ArcGIS Online Assistant: This link shows the URLs for each of your web maps/apps. You can alter the URLs, if needed. https://ago-assistant.esri.com/
Service Status for Organizations: This links shows which of your web maps/apps have broken links in them. http://maps.esri.com/AGSJS_Demos/OnlineContent/ServiceStatus/index.html
You will be prompted to login to your ArcGIS Online account.