GTFS Kit
GTFS Kit is an open-source Python library we created for analysing public transport scheduling data in the form of General Transit Feed Specification (GTFS) feeds. You can use it to read, edit, and write feeds, compute screen lines, locate scheduled trips geographically, and compute performance measures, such as daily number of trips per stop and service distance per route.

GTFS Kit powers most of our data analysis projects involving GTFS data.
We published GTFS Kit under the MIT License, a permissive open-source license, as an expression of our gratitude to the open-source community, whose tools we build with daily.