Available via download; Sharepoint offers these features:

Familiar search experience

• Search Center. Empower your people to quickly find the information they need through a familiar Web-style search interface and easy-to-use query syntax. Reconfigure the layout of Search Center elements without writing any code.
  
  
  Content Summaries. Quickly browse textual summaries of content that appear in the context of your search terms.

  Hit Highlighting. Quickly spot where your search terms appear in search results and content summaries.

  Best Bets and Definitions. View highlighted, editorialized sites or definitions for common search terms likely to have a single authoritative answer.

  Query Correction. Receive helpful “Did you mean?” suggestions for misspelled queries.

  Duplicate Collapsing. Find the content you’re looking for faster, using more concise, structured search results with grouped duplicates.

  Filter by Property. Filter content by configurable properties, including common properties like document type, author, title, size, location, and date of creation or last modification.

  Filter by Language. Retrieve search results that are automatically biased by your language, or pre-select a language to filter your results against.

  Sort by Date. Retrieve the most current information related to your search query.

  Tabbed Search Results. Create visual containers in the Search Center, for search results associated with your search scopes.

  E-mail / RSS Alerts. Stay on top of new information relevant to your work by subscribing to update notifications of your most common searches.

• Out-of-the-box Relevancy. Get relevant search results immediately, without extensive configuration, using a ranking engine developed in collaboration with Microsoft Research and Windows Live search.