A GTFS feed is composed of a series of text files collected in a ZIP file. Each file models a particular aspect of transit information: stops, routes, trips, and other schedule data. The details of each file are defined in the GTFS reference.

GTFS Spezification: https://developers.google.com/transit/gtfs/reference/

Check out https://github.com/CUTR-at-USF/awesome-transit for an up to date list of GTFS sources, tools and more.

• Routes are equivalent to “Lines” in public transportation systems. Routes are defined in the file routes.txt, and are made up of one or more Trips.
• A Trip represents a journey taken by a vehicle through Stops. Trips are time-specific — they are defined as a sequence of StopTimes, so a single Trip represents one journey along a transit line or route.
• A StopTime defines when a vehicle arrives at a location, how long it stays there, and when it departs.

Worldwide: https://transitfeeds.com/feeds https://transit.land/feed-registry/

Switzerland: https://opendata.swiss/de/dataset/timetable-2019-gtfs

Vienna: https://www.data.gv.at/katalog/dataset/ab4a73b6-1c2d-42e1-b4d9-049e04889cf0

quickly browse/validate a GTFS file. It even includes a map view.

Visit https://gtfs.pleasantprogrammer.com and upload your GTFS (it's a local web app)

GTFS editor, not as powerful as IBI transit (e.g. does not even have a map view for routes), but easy to install (simply download and run the executable)

https://github.com/WRI-Cities/static-GTFS-manager

Suite for importing / creating / editing and publishing GTFS feeds.

Quite complex to set up, but very powerful: https://data-tools-docs.ibi-transit.com/en/latest/dev/deployment/

Nice command line tool to extract / merge / edit GTFS.

OneBusAway is a library for transforming and merging GTFS data sets. Amongst others it features two handy CLIs:

http://developer.onebusaway.org/modules/onebusaway-gtfs-modules/current/onebusaway-gtfs-transformer-cli.html
http://developer.onebusaway.org/modules/onebusaway-gtfs-modules/current/onebusaway-gtfs-merge-cli.html

As of 2021 current builds are no longer provided (not in maven central, and not on the onebusaway nexus) - so probably you have to build it from source.

Nexus:
http://nexus.onebusaway.org/nexus/content/groups/public/org/onebusaway/onebusaway-gtfs-transformer-cli
http://nexus.onebusaway.org/nexus/content/groups/public/org/onebusaway/onebusaway-gtfs-merge-cli

no_ast.txt:

{"op":"remove","match":{"file":"routes.txt","route_short_name":"AST AST"}}
{"op":"remove","match":{"file":"routes.txt","route_short_name":"AST AST Maxi"}}

java -jar onebusaway-gtfs-transformer-cli-1.3.X.jar --transform=remove_ast.txt gtfs.zip gtfs_without_ast.zip

java -jar onebusaway-gtfs-transformer-cli-1.3.34.jar --transform='{"op":"retain", "match":{"file":"routes.txt", "route_short_name":"31"}}' --transform='{"op":"retain", "match":{"file":"routes.txt", "route_short_name":"33A"}}' gtfs_vienna.zip gtfs_vienna_only31+33A.zip

by Google https://github.com/google/transitfeed/wiki

sudo pip install transitfeed

Or get the trunk from

svn co https://github.com/google/transitfeed.git/trunk

Comes with some command line tools

• feedvalidator
• kmlwriter

• python script to convert GTFS to geojson
• pygtfs (seems outdated)

• JavaScript based GUI (runs in browser) https://github.com/WRI-Cities/static-GTFS-manager
• R package by ROpenSciLabs https://github.com/ropenscilabs/gtfsr
• Javascript by Conveyal https://github.com/conveyal/gtfs-data-manager
• FME https://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_ReadersWriters/gtfs/gtfs.htm

Use transitfeeds feedvalidator.py on a zip file to obtain a detailed report on the data quality.