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Aegir is an open-source hosting system for Drupal websites, created and maintained largely by Montreal-based developers. It enables sysadmins to provision, migrate, and manage large numbers of Drupal sites from a single control panel.

SageMath is a free open-source mathematics software system. The Pacific Institute for the Mathematical Sciences (PIMS), a consortium of Canadian universities, provides infrastructure and hosting for SageMath and has been a key institutional backer of open mathematical software in Canada.

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.

Axiom est un système d'algèbre informatique gratuit et open-source avec une longue histoire. Les mathématiciens canadiens soutenus par le CRSNG (Conseil de recherches en sciences naturelles et en génie) ont contribué de manière significative à ses bibliothèques et à sa documentation mathématiques officielles.

Pidgin is a free and open-source multi-protocol instant messaging client. Canadian open-source developers have long been contributors to Pidgin and its underlying libpurple library, which supports dozens of chat protocols.