I was wondering if there was a chance that a wxWidgets badge would be created. This toolkit is quite widely used for open-source projects. (Audacity, FileZilla, to name a few)
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Judging by the stats page, not for a while. Tag badges are automatically awarded once someone reaches 400 (for silver) or 1000 (for gold) upvotes for non-wiki answers in that tag.
Since no one has more than 26 upvotes at the moment, it's not likely to be any time soon.