Discourse is a new-generation web forum application written with Ruby on Rails; uses Postgres as its back-end and Redis for server-side caching. Discussion threads are flat and updated in realtime as people add comments. Shared links are automatically expanded so you know what's on the other side. Supports authentication against multiple providers. Mobile friendly.
web-application ruby rails forum software open-source support
The webapp that powers the OpenStreetmap website. Provides the API. rails If you can do it on openstreetmap.org, you'll be able to do it with this, from user accounts to editing and browsing.
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