Userscripts.org

【This is an answer to someone who asked to customize the links but later deleted his own post.】
I think you mean you want the "Jump" bar to offer search jump links to Wikipedia and so on for searching the same keyword that current page is searching, right? For example, when searching "superluminal speed" on Google, you want a link to an article (or a search) on Wikipedia about it on the "Jump" bar.

That would be easy if you know code editing since the source code of this script already contain enough information to put in your own links.

However, if you want me to make it for you, it's my pleasure (just a little bit patience needed). In this case, please search such keyword "GGGG" on all the sites your want to add and copy the URLs and then message the URLs and your e-mail address to me, so that I can send you the customized version of the script.