CUSI (Configurable Unified Search Interface) is a form based search tool which allows you to search the entire webspace. The service provided here reduces the load on the central CUSI server at NEXOR.
To submit a search, click on the input box with your mouse and enter the text of your search. You can change servers with the pop-down menu located on the right side of the "Submit" button. See CUSI at NEXOR for background information and the List of CUSI Services.
JumpStation is a comprehensive index in the UK, The EInet Galaxy also has a subject tree. If they don't help, the RBSE URL Search, the Nikos, or the WebCrawler might. The Lycos database is fairly new, but very popular already, and sometimes gets overloaded. The World Wide Web Worm is another large scale database that is worth checking out. The CUI W3 Catalog is a fairly comprehensive semi-automated high-quality global index. Nexor's ALIWEB is semi-distributed special purpose global index for the Web, which is growing slowly. The GNA Meta-Library is becoming more out of date as it is maintained manually, but has got non-WWW refernces also. CityScape's Global On-Line Directory boasts to be the "the ultimate Internet reference" soon, but is also manual so I'm not so sure. DA-CLOD is a database where anybody can add URLs. comp.infosystems.announce refers to your local News system for the actual articles (which may no longer exist). Yahoo features a hierarchically organised subject tree.
ArchiePlex is a full-featured Archie gateway for the web, and locates files on Anonymous FTP sites. The Language List and the Free Compilers and Interpreters List should be obvious. Nexor's Mac Software Catalog is a Web view of Michigan's Mac Archive. The IBMPC Windows Archive is part of the HENSA/Micros archive, and the Unix Archive is also maintained by HENSA in the UK. The MS-DOS Archive is the famous wustl one.
The Whole Internet Catalog is an up-to-date copy of the appendix in Ed Krol's The Whole Internet Guide. Veronica searches Gopherspace, but is very busy and often gives far too many matches to be useful. The WAIS Directory of servers will find relevant WAIS sources. The Clearinghouse for Subject-Oriented Internet Resource Guides has lists of resource guides.