[gp2000]

Although it is a historical (and disavowed) footnote, the Open Text Index launched in April 1995 and sported full text indexing of web pages -- more than 6 months before Alta Vista's launch in December that year.

It did serve as a back-end search for Yahoo! though it never could keep up with the full query volume. It was lambasted by the creators of Google for experimenting with putting clearly-marked ads in search results. That transgression looks hilariously quaint to modern eyes.

https://www.referenceforbusiness.com/history2/72/Open-Text-C...