Commercial Search Engines

Used by Lycos.com and a bunch of others.

http://search.looksmart.com/

Ad-heavy. Seems to like to return front pages rather than deep content. Does not appear to make cached pages available.

Involved in open source search with Wikia via Grub.

Update: Nick Lewis points out that Wikia's attempt to mix community-driven with for-privane-profit is likely to fail. Which is fine as OpenZuka's been planning on world domination all along. Steve Anderson noted the need for a nonprofit alternative months ago. Still, the key part of opening up algorithms, shared by OpenZuka, is worth keeping an eye on.

http://search.wikia.com/wiki/Search_Wikia

Building a new open global search engine.

AllTheWeb.com

http://AllTheWeb.com

Does not appear to have caches of indexed content available.

As of 2007 July 24, proclaimed to be experimenting with live search.

MyLiveSearch is approaching it's public beta as of the end of May, 2007.

http://www.brisbanetimes.com.au/news/technology/better-than-google-creat...

It works differently from other search engines is that it takes others' indexing as a starting point to do a live search of the Internet before returning results.

Interesting approach, and the article has a mention of Nutch's aggregation of indexes approach.

OpenZuka could borrow from both...

Using Google's feedback form...

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Go straight to IBM's article:
http://www.alphaworks.ibm.com/tech/uima/

Search concepts, not keywords, IBM tells business
Mon Aug 8, 2005 5:03 AM BST

By Eric Auchard

NEW YORK (Reuters) - IBM plans to give away key search technologies for corporate data retrieval that use concepts and facts instead of simpler "keyword" searches relied upon by consumer Web companies such as Google Inc. (GOOG.O: Quote, Profile, Research), the world's largest computer company said on Monday.

These projects on cursory examination are of no immediate relevance to the openzuka cause:

LabLounge is simply a terrible search engine.
Open Text is neither open source nor search, http://en.wikipedia.org/wiki/Open_Text_Corporation