Here's an updated list of (I think) all of the software in the thread:
Alchemy art software - http://al.chemy.org
ArcGis - http://www.esri.com/software/arcgis
ArtRage - https://www.artrage.com
Astrosynthesis - http://nbos.com/products/astrosynthesis
Aurora toolset - http://www.neverwinternights.info/builders.htm (General Information)
AutoREALM - http://sourceforge.net/projects/autorealm/ Campaign
Blender - http://www.blender.org/
carrara pro 6 - http://www.daz3d.com/carrara-8-5-pro
Cartographer 3 - http://www.profantasy.com/products/cc3.asp Drawplus X4 - http://www.serif.com/drawplus/ Dundjinni - http://www.dundjinni.com
CityEngine - http://www.esri.com/software/cityengine/
CoPan - http://www.underhill.ca/Software/Cop...s/CopanWin.php
DomMap - https://web.archive.org/web/20130228...m3minions.com/
Dungeon Painter Online - http://pyromancers.com/dungeon-painter-online/
DungeonForge - https://www.kickstarter.com/projects...dungeon-master (This one seems like a related project but Idon't think it got funded)
DungeonForge/MapX - http://1drv.ms/1Uh9jGJ (Doesn't seem to be available for download)
Fireworks - https://www.adobe.com/products/fireworks.html
Flaming Pear http://www.flamingpear.com/products.html (I love Lunar Cell, Glitterato)
Fractal Mapper - http://www.nbos.com/products/fractal-mapper
Fractal Terrains 3 - https://secure.profantasy.com/products/ft.asp Gimp - http://www.gimp.org
G.Projector - http://www.giss.nasa.gov/tools/gprojector/
G'MIC - http://gmic.eu
GDAL - http://www.gdal.org/index.html
General List of Raster Editors - https://en.wikipedia.org/wiki/Compar...aphics_editors
Genetica Viewer and Wood Workshop - http://www.spiralgraphics.biz/index.htm\
GeoServer - http://geoserver.org
Global Mapper - http://www.bluemarblegeo.com/products/global-mapper.php
GRASS - http://grass.osgeo.org
Heavy Metal Map - http://www.heavymetalpro.com/HMMap_Features.htm Adobe
HexoGrapher - http://www.hexographer.com
Illustrator - http://www.adobe.com/products/illustrator.html
ImageSynth - Retired
InkScape - https://inkscape.org/en/
ISIS3 - https://isis.astrogeology.usgs.gov/index.html
It's Full of Stars - https://onedrive.live.com/?cid=73256...B937B6CF%21122
Leveler - http://www.daylongraphics.com/products/leveller.php
MandelBulber - http://www.mandelbulber.com
MathMap - http://www.complang.tuwien.ac.at/schani/mathmap/
MicroDem - http://www.usna.edu/Users/oceano/pgu...m/microdem.htm
Modo - http://www.thefoundry.co.uk/products/modo/ (As far as I can tell it was ImageSynth)
Nendo - http://www.izware.com/nendo/index.htm
OpenLayers - http://openlayers.org
OpenSCAD - http://www.openscad.org
Ortelius - http://www.mapdiva.com
Paint Tool Sai - https://www.systemax.jp/en/sai/
PD Particles - http://www.thebest3d.com/pdp/
PhotoPlus - http://www.serif.com/photoplus/
Planet Genesis - http://planetgenesis.sourceforge.net
PostGIS - http://postgis.refractions.net
QuantamGIS - http://www.qgis.org/en/site/
Radeon Tray Tools - http://www.guru3d.com/article/ati-tray-tools-/
Real Draw - http://www.mediachance.com/realdraw/
Relief Map Generator - http://www.snapfiles.com/get/gfreliefmap.html
RPG MapMaker - http://fmteau.perso.neuf.fr/rpgmapmaker/rpgmapmaker.htm
Terraform (Now available as an Ubuntu package) - http://manpages.ubuntu.com/manpages/...rraform.1.html
Texture Maker - http://www.texturemaker.com/news.php
Tiled - http://sourceforge.net/projects/tiled/
TwistedBrush Pro - http://www.pixarra.com
uDIG - http://udig.refractions.net
Unity Game Engine addon downloads - http://unity3d.com/learn/resources/downloads
ViewingDale - http://www.viewingdale.com
Visio - https://products.office.com/en-us/vi...chart-software
Vue Frontier - VUE Frontier
Wilbur - http://www.fracterra.com/software.html
World Machine - http://www.world-machine.com
WorldSpinner - http://worldspinner.com
Xara Xtreme - http://www.xaraxtreme.org
Xtreme - http://www.xara.com/us/ (?)
YeOlde Map Maker - http://www.yeoldemapmaker.com