PopSearch Safari Extension
PopSearch Safari Extension 2.0 for Mac can be downloaded from our website for free. The application is included in Internet & Network Tools.
From the developer:
PopSearch Safari Extension lets you easily add any search engine you like to Safari. If you use Safari 6, you can even access your custom search engines right in the combined address/search bar by typing short keywords like "w" for Wikipedia before your search terms. Otherwise, simply use the convenient popup search bar by typing Command-K or another hotkey of your choosing.
Features: It's easy to add other search engines to the built-in ones.
You may want to check out more Mac applications, such as FullPath Safari Extension, ZENTUBE Safari Extension or Detox Safari Extension, which might be related to PopSearch Safari Extension.