PostGIS
PostGIS Project Steering Committee (OSGeo) · GIS & mapping
Spatial extension for PostgreSQL adding geometry, geography and raster types with indexing and hundreds of SQL functions
GPL-2.0-or-laterOpen sourceFreeSelf-hostedNov 2, 2026
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PostgreSQL
PostgreSQL Global Development Group · Relational databases
Open-source object-relational database server with a large extension ecosystem (PostGIS, pgvector, TimescaleDB) and broad SQL coverage
PostgreSQLOpen sourceFreeLocalSelf-hostedBroken
Rôle d'évaluation foncière (Québec)
Gouvernement du Québec — Ministère des Affaires municipales et de l'Habitation · Real estate valuation & property data
Québec's municipal property assessment rolls: per-unit values and building attributes published by municipalities and as open data by the MAMH
CC-BY-4.0FreeNov 2, 2026
RSMeans Data
Gordian · Construction estimating & quantity surveying
Gordian's construction cost database of unit prices, assemblies and square-foot models with location factors, sold online and in annual books
ProprietaryPaidEnterpriseNov 2, 2026
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