Infoseek:

Infoseek also started out in 1994, claiming to have been founded in January. They really did not bring a whole lot of innovation to the table, but they offered a few add on's, and in December 1995 they convinced Netscape to use them as their default search, which gave them major exposure. One popular feature of Infoseek was allowing webmasters to submit a page to the search index in real time, which was a search spammer's paradise.

AltaVista:

AltaVista debut online came during this same month. AltaVista brought many important features to the web scene. They had nearly unlimited bandwidth (for that time), they were the first to allow natural language queries, advanced searching techniques and they allowed users to add or delete their own URL within 24 hours. They even allowed inbound link checking. AltaVista also provided numerous search tips and advanced search features.

Due to poor mismanagement, a fear of result manipulation, and portal related clutter AltaVista was largely driven into irrelevancy around the time Inktomi and Google started becoming popular. On February 18, 2003, Overture signed a letter of intent to buy AltaVistafor $80 million in stock and $60 million cash. After Yahoo! bought out Overture they rolled some of the AltaVista technology into Yahoo! Search, and occasionally use AltaVista as a testing platform.

Inktomi:

T he Inktomi Corporation came about on May 20, 1996 with its search engine Hotbot. Two Cal Berkeley cohorts created Inktomi from the improved technology gained from their research. Hotwire listed this site and it became hugely popular quickly.

In October of 2001 Danny Sullivan wrote an article titled Inktomi Spam Database Left Open To Public, which highlights how Inktomi accidentally allowed the public to access their database of spam sites, which listed over 1 million URLs at that time.

Although Inktomi pioneered the paid inclusion model it was nowhere near as efficient as the pay per click auction model developed by Overture. Licensing their search results also was not profitable enough to pay for their scaling costs. They failed to develop a profitable business model, and sold out to Yahoo! for approximately $235 million, or $1.65 a share, in December of 2003.

Ask.com (Formerly Ask Jeeves):

In April of 1997 Ask Jeeves was launched as a natural language search engine. Ask Jeeves used human editors to try to match search queries. Ask was powered by DirectHit for a while, which aimed to rank results based on their popularity, but that technology proved to easy to spam as the core algorithm component. In 2000 the Teoma search engine was released, which uses clustering to organize sites by Subject Specific Popularity, which is another way of saying they tried to find local web communities. In 2001 Ask Jeeves bought Teoma to replace the DirectHit search technology.

Jon Kleinberg's Authoritative sources in a hyperlinked environment [PDF] was a source of inspiration what lead to the eventual creation of Teoma. Mike Grehan's Topic Distillation [PDF] also explains how subject specific popularity works.

On Mar 4, 2004, Ask Jeeves agreed to acquire Interactive Search Holdings for 9.3 million shares of common stock and options and pay $150 million in cash. On March 21, 2005 Barry Diller's IAC agreed to acquire Ask Jeeves for 1.85 billion dollars. IAC owns many popular websites like Match.com, Ticketmaster.com, and Citysearch.com, and is promoting Ask across their other properties. In 2006 Ask Jeeves was renamed to Ask, and they killed the separate Teoma brand.

AllTheWeb

AllTheWeb was a search technology platform launched in May of 1999 to showcase Fast's search technologies. They had a sleek user interface with rich advanced search features, but on February 23, 2003, AllTheWeb was bought by Overture for $70 million. After Yahoo! bought out Overture they rolled some of the AllTheWeb technology into Yahoo! Search, and occasionally use AllTheWeb as a testing platform.

Meta Search Engines

Most meta search engines draw their search results from multiple other search engines, then combine and rerank those results. This was a useful feature back when search engines were less savvy at crawling the web and each engine had a significantly unique index. As search has improved the need for meta search engines has been reduced.

Hotbot was owned by Wired, had funky colors, fast results, and a cool name that sounded geeky, but died off not long after Lycos bought it and ignored it. Upon rebirth it was born as a meta search engine. Unlike most meta search engines, Hotbot only pulls results from one search engine at a time, but it allows searchers to select amongst a few of the more popular search engines on the web. Currently Dogpile, owned by Infospace, is probably the most popular meta search engine on the market, but like all other meta search engines, it has limited market share.

One of the larger problems with meta search in general is that most meta search engines tend to mix pay per click ads in their organic search results, and for some commercial queries 70% or more of the search results may be paid results. I also created Myriad Search, which is a free open source meta search engine without ads.