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
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