What Open Source GIS tools do you use / recommend?

Question

I'm researching Open Source GIS resources - and wonder out of all the Open Source tools that are out there - what people are actually using / finding useful.

http://en.wikipedia.org/wiki/GIS_software

Answer 1

Here's a few I use regularly

• postgis
• gdal
• mapserver
• uDig
• grass
• geos
• geoserver
• gmt
• openlayers
• tilecache
• qgis

Big list here http://opensourcegis.org/

Answer 2

Another big list: OSGeo is a collaboration to support open source geospatial software.

Answer 3

http://sharpmap.codeplex.com for the .Net world. We're not under OSGeo, so you won't find us there.

Answer 4

Here are other resources:

• Comparison of GIS software in Wikipedia
• An Overview of Free & Open Source Desktop GIS (FOS-GIS)

As MarkJ pointed, OSGeo.org is a must-check place as well.

Answer 5

I have found Quantum GIS to be quite useful:

http://qgis.org/en/about-qgis.html