The Pinball Map website, API, and app make extensive use of many free and/or open source services (as well as paid services). The website uses Ruby on Rails along with open source gems. The app uses React Native and likewise is aided by many open source modules.
Dokku. We use Dokku to build and deploy Pinball Map! It is a free service, though we support it with a monthly donation.
DigitalOcean hosts our server and Postgresql database. This is fully paid for via our Patreon supporters.
Mapbox is used for map tiles.
Expo manages, among many things, the app development and build processes.
Scout APM tracks performance monitoring for the website and API.
Sentry is used for crash reporting on the app!
Google Maps processes the geocoding requests. We also use the Places API for location submissions.