Specialised Search Engines

  When one thinks of search engines the first one that comes to mind
is google.However there are a few that do specific types of search.For
example sample these:
1.Copyscape:this site finds out if the content in a site is also present
in another site.(checks for online plagiarism)
2.Fizy:music search.
3.Tineye:finds the source of an image that us available online.
4.Technorati:blog search.
5.Wolfram-alpha:solves math problems.
6.Metasearch engines:these sites search a term in multiple search
engines and display the aggregated result.
  That's it for now...