Potlatch, named after a native American custom of giving gifts, is a Flash-based online editor for OpenStreetMap. Its biggest advantage over other editors is that it doesn't need to be installed for you to use it. You can use any computer with a browser and a Flash plugin to edit OpenStreetMap using Potlatch, and it's safe to use on public computers, provided you log out of the site afterward.
Potlatch has fewer features than the desktop editors we'll cover, but it's still able to create and edit the same data as any other editor. It has a system of presets, which makes tagging the data you create faster and prevents typing errors, but still allows you to enter free-form keys and values for tags. Potlatch does include support for photo mapping, but the workflow currently involves uploading your pictures to a separate website, so we won't cover this feature.