There are 5 repositories under gtfs-rt topic.
Intermodal Mobility Information System
Tools for working with GTFS public transit data in ArcGIS
an open directory of mobility feeds and operators — powers both Transitland v1 and v2
Real-time New York City subway service map
Collect real-time transit data and process it into a retroactive GTFS 'schedule' which can be used for routing/analysis
ActivityPub-compliant server for distributing transit service alerts
New York City Subway Status Page driven by real-time feeds
Web app to inspect & analyze any GTFS Realtime feed.
Website that detects headway discrepancy on New York City Subway system using live countdown clocks
Build a realtime transit departures widget from GTFS and GTFS-Realtime Data.
Read a GTFS Realtime feed from stdin, print human-readable or as JSON.
GTFS and GTFS-RT structures for Swift
Expose Berlin & Brandenburg transit data as a GTFS-RT feed.
Collection of short geospatial scripts and more...
Visualization Tool for GTFS-RT Bus Delays
Converts GTFS-RT to Linked Connections
Official developer documentation for OneBusAway
Inspect, visualise and analyse GTFS Realtime feeds in your browser
Ⓜ📡 Web server that generates GTFS Realtime data for transit in South Florida
Match HAFAS realtime data with GTFS Static data.
Serves GTFS-RT feed created from editable JSON
provide Wiener Linien Realtime API as GTFS-RT for OpenTripPlanner via websocket
Expose Hamburg transit data as a GTFS-RT feed.
Transform a differential GTFS Realtime feed into a full dataset/dump.
Easy to use, minimal, and simple implementation of the Transitland v2 REST API for fetching GTFS, GTFS Realtime, GBFS, and MDS data in Javascript and/or Typescript.
Pulls service change and train arrival data from the MTA NYCT GTFS. Also has a widget for showing which subway lines have issues.
A one-stop resource for modern, equitable and accessible public transit products and services.
(Obsolete) Fetch LA Metro Alerts in Protobuf or Rust Structs, Written in rust