How to change the default search queries in Opera by editing search.ini and buttons.ini, more specifically dedicated to Opera 6, but usable for Opera 7
search engine geared to scientific information
Search for the latest audio, video, images and more
A pretty good web search engine made by Matt Wells.
Search Engine for open source soure code
Snap is back in the search business with quite a different approach to web search.
Agent Ransack is a free tool for finding files and information on your hard drive fast and efficiently. When searching the contents of files Agent Ransack displays the text found so you can quickly browse the results without having to separately open each