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Vendor Google https://www.google.com/intl/en/about/
License Apache 2
Documentation https://github.com/ google/transitfeed
Data Input GTFS
Data Output Errors and warnings
Website https://github.com/ google/transitfeed/ wiki/FeedValidator

"The feedvalidator is a command line tool that checks a GTFS feed for problems and generates a HTML report. Running it on your transit data feed and fixing the issues that it finds can save you from display and routing problems down the road."[1]