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.

webbase is an internet web crawler written in C and later ported to C++. It uses a MySQL database to store information about crawled URLs. It is available as a command line program or as a library (shared or static). It has two main functions: crawl the WEB to get documents and build a full text database with these documents. The crawler part visits the documents and stores intersting information about them locally. It visits the document on a regular basis to make sure that it is still there and updates it if it changes. The full text database uses the local copies of the document to build a searchable index. The full text indexing functions are not included in webbase.

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).

Harvest is a system to collect information and make them searchable using a user friendly web interface. Harvest can collect information on inter- and intranet using http, ftp, nntp as well as local files like data on harddisk, CDROM and files on file servers. Current list of supported formats in addition to HTML include dvi, ps, fulltext, mail, man pages, news, troff, WordPerfect, C sources and many more.

The ht://Dig system is a complete world wide web indexing and searching system for a small domain or intranet. This system is not meant

SWISH-Enhanced is a fast, powerful, flexible, and easy to use system for indexing collections of Web pages or other text files. Key features include the ability to

Key features - Support for http, https, ftp, nntp and news URL schemes. - htdb virtual URL scheme support for indexing SQL databases. - text/html, text/xml, text/plain, audio/mpeg (MP3) and image/gif MIME types built-in support. - External parsers support for other document types. - Ability to index multilangual sites using content negotiation. - Searching all of the word forms using ispell affixes and dictionaries. - Stopwords, synonyms and acronyms lists. - Boolean query language support. - Results sorting by relevance, popularity rank, last modified time and by importance (a multiplication of relevance and popularity rank). - Various character sets support. - Phrases segmenting for Chinese, Japanese, Korean and Thai languages. - Accent insensitive search. - mod_dpsearch - a search module for Apache web server (both 1.x and 2.x branches). - Internationalized Domain Names support. - The Summary Extraction Algorithm.