Windows:
VECTOR: Inkscape Open Office Draw (minimal utility)
RASTER: GIMP PhotoGIMP Paint.Net Artweaver
PRINTING: PosterRazor Poster Printer Rasterbator Posteriza
MacOS:
VECTOR: Inkscape Synfig Open Office Draw -- http://www.openoffice.org/product/draw.html Xara Xtreme LX (may be unstable)
RASTER: GIMP PhotoGIMP
PRINTING: PosterRazor
Linux:
VECTOR: Inkscape Open Office Draw Synfig Xara Xtreme LX
RASTER: GIMP PhotoGIMP Krita
Any OS: Clipart: Open Clip Art Clker Clip Art Search --Look for RPG Tiles :-)
You may also want to see my thread about free digital map files of countries around the world: http://boardgamegeek.com/article/1765975#1765975 RPtools Hexdraw (windows)
