IFMapper (Free)

An interactive fiction (text adventure) mapping tool, 'ifmapper' automatically remembers updates and allows you to easily switch between maps that you have created. Map files are stored in the "ifmapper" folder.

You can create and delete locations, and create one-way links (by deleting one direction) as well as normal, dotted, and double. Each location has a name and room for notes such as objects they may have.

An early test version really, feedback welcome.