Write a Review Add Product

PROJ — GIS (Open Source)

PROJ is an open-source GIS solution from OSGeo. Compare it against 80 other GIS tools on FreeSoftwareX — by features, licensing and price — and request a quote or demo free in 2026.

What is PROJ?

PROJ is open source — its source code is publicly available and free to use, modify and self-host, usually with an active community and no licensing fees. It is categorised under GIS and published by OSGeo. Buyers typically evaluate PROJ when they need a dependable GIS option and want to weigh the trade-offs between free, open-source and paid tools before committing.

PROJ alternatives

If PROJ isn't the right fit, compare these GIS alternatives side by side:

ARC/INFOArcGISArcGIS OnlineArcGIS ServerArcIMSArcMapArcSDEAutoCAD Map 3DAutodesk MapGuideAutodesk TopobaseBentley MapCadcorp SISCapawareCartoDB (CARTO)

Frequently asked questions

Is PROJ free?
Yes. PROJ is open source and free to use, with no purchase cost for the core product.
What are the best PROJ alternatives?
Popular GIS alternatives to PROJ include ARC/INFO, ArcGIS, ArcGIS Online, ArcGIS Server. See the full list of GIS on FreeSoftwareX.
What type of software is PROJ?
PROJ is an open-source GIS tool developed by OSGeo.

← All GIS · More from OSGeo

Browse live leads →List your business free