PostGIS

OSGeo Canada (OSGeo Local Chapter) actively promotes and contributes to GeoServer and the broader open geospatial software stack. Natural Resources Canada and provincial governments use and contribute to GeoServer for publishing geospatial data through standard OGC web services.

QGIS is the leading free and open-source desktop GIS application. Canadian government agencies, universities, and environmental organizations are among the world's largest QGIS user communities. Natural Resources Canada, Parks Canada, and multiple provincial mapping agencies have contributed data, plugins, and development.

Ruby payment abstraction library used by ecommerce applications.

A multimodal journey-planning engine widely used with Canadian public transit data and open standards.