What are some alternatives?
When comparing PyMapper and Tiamat, you can also consider the following products
Campaign Cartographer - Campaign Cartographer is the leading map making software for games (RPGs, miniatures and wargaming).
DUNGEONFOG - Online authoring tool to draw rpg maps & dungeons, create dynamic notes and share your maps online. Create dungeons, world maps and more with the easy to use map editor and create your game master notes dynamically.
Dungeon Painter - Dungeon Painter is a free powerful encounter map design tool.
AutoREALM - AutoREALM is a Free GNU mapping software (a "cartographer") that can design maps of...
Inkarnate - A free-form map editor for role-playing games, focusing on overland and continental maps.
Dundjinni - Dundjinni is a full-featured fantasy map creation program.