Launching Next has discovered 7 site search startups.
searchIQ
Site Search Plugin to Improve UX, UI and Conversion
Sajari
Advanced Site Search, Recommendation & Personalization for Websites
ThatNeedle.com
Better website search
Measured Search
Search as a Service for e-Commerce
Site Search Engine, Free and Pro Versions - FreeFind.com
Free site search engine. Add a site search engine to your website today, for free, in less than ten minutes. Choose from Free and Pro site search engines.
Site Search Engine, Free and Business Website Search - PicoSearch.com
Add a free site search engine to search your web site - no software, easy to install, free! Plus professional site search engines for business site search.