Zim has a number of interesting features. In addition to the built-in plugins that enable you to insert a calendar or a screenshot into a page, create a to-do list, view a wiki page in a Web browser, and check spelling. A few other things, too. All of the plugins are available from Zim's menus.
If you need to export your wiki pages to another format, you're stuck with two formats. The first is HTML, the language used to format Web pages. The other is txt2tags, which uses wiki-like markup from which you can generate documents in such formats as HTML, XHTML, LaTeX (a powerful typesetting program), and more. To use this, you'll need a program called txt2tags installed on your computer to do the conversions.

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When exporting to HTML, you can choose to use one of these templates:
- Presentation, which creates a Web page with simple Javascript navigation
- Print, a plain page that you can send to directly to your printer
- Slide show, which turn your wiki pages into a slideshow using a format called S5
If you're really adventurous you can try to create your own export template. You can find details here. I haven't tried it, so I can't tell you how well or badly it works.