You can install the Java applet at your Web site so that other users can browse your mind maps through their Internet browsers, if they have Java 1.4 or greater installed.
The FreeMind home page has a sample map and applet installed at:
http://freemind.sourceforge.net/Freemind-development.html
(cut and paste the link to your regular browser)
To put a map on your own page, you'll first need to download the applet called "freemind-browser", which can be found at the bottom of the FreeMind download page:
The downloaded archive contains two files, freemindbrowser.jar and freemindbrowser.html.
It's a good idea to put both these files, along with the map itself, in a directory on your Web site. Create a link from your page to freemindbrowser.html. Edit freemindbrowser.html, setting the path inside it to point to your mind map. (You can locate the files in other ways, but be aware that the applet's jar file must be located at the same server as the map itself. This is for Java security reasons.)
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Clicking the link to freemindbrowser.html will display your map in browse mode, that is, read-only. Clicking the nodes toggles folding or opens links. Dragging the background will move the map. You can also search the map, using the node popup menu.