iGetter works in Safari via the contextual menu. On a download link, you would right click or control key/click to bring up the contextual menu for initiating the download. I haven't used, however, this is what I understand from reading the site's product description.
Have you installed the plug-in? If you did, check your Library (either main or user)>Contextual Menu Items folder to make sure it is located in the correct location.
SpeedDownload would be another option for Safari downloads. This application runs in lieu of Safari's download feature, which appears to be the type of downloader you are looking for.
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