Glimpse (which stands for GLobal IMPlicit SEarch) is a popular UNIX indexing and query system that allows you to search through a large set of files very quickly. Glimpse supports most of agrep's options (agrep is our powerful version of grep) including approximate matching, Boolean queries, and even some limited forms of regular expressions. It is used in the same way, except that you don't have to specify file names. So, if you are looking for a needle anywhere in your file system, all you have to do is say glimpse needle and all lines containing needle will appear preceded by the file name.

All-in-one index and search server. It is, on one hand, a stand-alone web spider that can collect data from local and remote sites following a precise set of rules and using a variety of options defined by the search engine administrator. On the other hand, Alkaline offers users, navigating through a web site, a fast and relevant tool for searching hundreds of thousands indexed documents. Alkaline powers high profile sites of World Health and International Labor Organizations, Symbol Technologies and BBC America as well as hundreds of small non-commercial ones, free.

Namazu is a full-text search engine intended for easy use. Not only does it work as a small or medium scale Web search engine, but also as a personal search system for email or other files. Namazu broadly consists of three components, mknmz that creates index before searching (written in perl), namazu which searches documents based on the created index - command line script (written in C), and namazu.cgi, a CGI scrip for searching documents based on the created index (written in C).

Excite for Web Servers makes it easy for you to add searching -- Excite, Inc.'s advanced concept-based searching -- to your Web site. Excite for Web Servers provides a simple Web-browser interface for doing all the things necessary to enable concept-based searching of collections of documents such as administering, indexing, and searching over the collections. In particular, one can: define a document collection -- that is, specify a set of documents to be considered a single collection over which one can search, design customized pages for displaying to users who wish to search over that collection, index that collection, monitoring the progress, and search the collection.