Wikipedia: OpenSearch is a collection of technologies that allow publishing of search results in a format suitable for syndication and aggregation. It is a way for websites and search engines to publish search results in a standard and accessible format.

Some of search plugins that I have made:

  1. Web Developer's Help - version 1.0
  2. Google Image Search - version 1.0
  3. Google Product Search - version 1.0
  4. Google Book Search - version 1.0
  5. Google Code Search - version 1.0
  6. Warez-bb.com Search - version 0.6 (install from here , thread on the forum)
  7. Japanimusic.net Search - version 0.1 (install from here or from the forum)
  8. WarezForum.cz Search - version 0.1 (install from here)
  9. Demonoid.com Search - version 0.1 (install from here or from the forum)
  10. worryaboutyou.com Search - version 0.1
  11. Waz-warez.org Search - version 0.1 (install from here or from the forum)
  12. pornBB.org Search - version 0.1 (install from here) WARNING: ADULT CONTENT
  13. Wide6.com Search - version 0.1 (install from here) WARNING: ADULT CONTENT
  14. OVGuide.com Search - version 0.1 (install from here)
  15. docs.Python Search - version 1.0

My plugins at mycroft.mozdev.org