- GDAL Translator library for raster and vector geospatial data formats, used by > 100 other software
- GRASS GIS A raster/vector open source GIS
- libgeotiff Library to read/write GeoTIFF keys
- MapServer A popular web mapping application
- PDAL Point Cloud Data Abstraction Library
- PostGIS Spatial database extender for PostgreSQL
- QGIS A cross platform desktop GIS.
- QField Mobile data collection app for Android, iOS and Windows.
- R A free software environment for statistical computing and graphics
- mundipy A Python framework for spatial data analysis
See bindings
- FME A GIS translator package. Includes a PROJ based transformer.
- Avenza Maps Top mobile mapping app for offline navigation and data collection.
- Bunting Labs No-code GIS infrastructure
- Agency for Data Supply and Infrastructure of Denmark (SDFI)
- Land Information New Zealand (LINZ)
- National Land Survey of Finland (NLS)
- National Land Survey of Iceland (NLS)
- Netherlands Partnership Geodetic Infrastructure (NSGI)
- Nordic Geodetic commission (NKG)
- Norwegian Mapping Authority (Kartverket)
- Swedish mapping, cadastral and land registration authority (Lantmäteriet)
- USGS: PROJ initial author, Gerald E. Evenden, worked at USGS
- Istituto Nazioanle di Astrofisica (INAF) : Planetary Mapping and GIS Laboratory
- Ecole Nationale des Sciences Géographiques (ENSG-géomatique) : French geomatic school which depends on the National Institute of Geographic and Forest Information (IGN)
(add yourself here if you are a direct user of PROJ API or utilities)
(add yourself here if you are a direct user of PROJ API or utilities)
PROJ development, as an upstream dependency of GDAL, benefits from funding brought by its sponsors