Software and organizations using or contributing to PROJ
Free and open source software
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
Mergin Maps Field data collection app built on top of QGIS with cloud sync
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
PROJ bindings in other languages
Proprietary licensed software
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
Pix4D Cloud, desktop and mobile photogrammetry processing and data capture software.
Geodetic organizations
Swedish mapping, cadastral and land registration authority (Lantmäteriet)
USGS: PROJ initial author, Gerald E. Evenden, worked at USGS
Public organizations
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)
Private organizations
(add yourself here if you are a direct user of PROJ API or utilities)
Sponsors
PROJ development, as an upstream dependency of GDAL, benefits from funding brought by its sponsors