Web Feed Tester
feed-test.kevincox.caTools to help devs and others improve both client and server ends of feeds are to be welcomed, considering just how badly some implementations are... https://www.earth.org.uk/RSS-efficiency.html
Tools to help devs and others improve both client and server ends of feeds are to be welcomed, considering just how badly some implementations are... https://www.earth.org.uk/RSS-efficiency.html