:If the agency has sufficient in-house technical expertise, they may wish to produce and maintain the GTFS feed themselves. Several of the industry-standard scheduling software packages from vendors such as Trapeze<ref>[http://www.trapezegroup.com/ Trapeze Group Limited]</ref>, HASTUS <ref>[http://www.giro.ca/en/products/hastus/index.htm Giro, Inc. "HASTUS - Transit scheduling and operations."]</ref> , Connexionz<ref>[http://www.connexionz.us/home Connexionz Limited. "Smart Transit Solutions."]</ref>, and Mentor Engineering <ref>[http://www.mentoreng.com/products/streets-transit/streets-schedule/schedule.html Mentor Engineering. "Transit Scheduling Software."]</ref> can often export agency data into the GTFS format, facilitating the GTFS creation & maintenance process. However, agencies should not necessarily assume that the output of these tools produces perfect GTFS data, as agencies have indicated that they often still need to perform manual data processing on the GTFS data exported from these tools before it will be acceptable for application use <ref>[http://ntl.bts.gov/lib/34000/34000/34053/FDOT_BDK85_977-12_rpt.pdf Sean Barbeau, Nevine Labib Georggi, and Philip Winters (2010). "Travel Assistance Device (TAD) -- Deployment to Transit Agencies," National Center for Transit Research.]</ref>.
:For agencies who do not have access to sophisticated scheduling software, there are
free spreadsheet-based tools for creating and maintaining GTFS data such as and XLS Tools for Google Transit by Bob Heitzman<ref>[https://sites.google.com/site/rheitzman/ Bob Heitzman. "XLS Tools for Google Transit."]</ref>, which were repackaged as “GTFS Builder” by the Rural Transit Assistance Program <ref>[http://www.nationalrtap.org/public/WebApps/GTFSBuilder.aspx National Rural Transit Assistance Program. "GTFS Builder."]</ref>. OpenPlans, a nonprofit 501(c)3 that produces open-source civic software, started an open-source web-based GTFS Editing Tool that is now maintained by Conveyal <ref>[https://github.com/conveyal/gtfs-editor Conveyal. "GTFS Editor."]</ref>. For agencies without high-quality bus stop inventories, the open-source GTFS-OpenStreetMap Synchronization tool (GO-Sync) can help leverage crowd-sourced improvements of their GTFS bus stop inventory<ref>[https://github.com/CUTR-at-USF/gtfs-osm-sync Khoa Tran, Edward L. Hillsman, S. Barbeau, and M. A. Labrador (2011), "GO-Sync- A Framework to Synchronize Crowd-Sourced Mapping Contributions from Online Communities and Transit Agency Bus Stop Inventories," in ITS World Congress, Orlando, Florida, USA, October 16, 2011.]</ref>. There are also many educational resources available online from the transit developer community for agencies interested in creating a GTFS feed<ref>[http://code.google.com/p/googletransitdatafeed/wiki/OtherGTFSTools Google Transit Data Feed. "Other GTFS Tools."]</ref> <ref>[https://groups.google.com/forum/?fromgroups#!forum/google-transit-partner-support Google, Inc. "Google Transit Partner Support Google Group."]</ref>.
In order to create and maintain GTFS, it is necessary to develop an understanding of the specification. Several [[GTFS training materials]] are available.