ES.Net is a full-text indexing crawler and search engine produced by Innerprise Corp. It runs on the platform of Windows and crawls and indexes a variety of types of documents from the web and local/network file system. Its cost is only about $500. Thus, ES.Net is a good search engine product for companies whose intranet is based on Windows.

The total owning cost (TOC) of integration of search engine with the Intranet is low. All configurations for crawling, indexing, and searching are done through a user-friendly web-based application. Crawling and index are running as services in the background. They support built-in scheduler, and thus, once setup, ES.Net can automatically crawl and index without any user interaction. The back-end database for the search engine can be either SQL Server or free MySQL.

ES.Net supports common file types through the use of IFilters, including HTML, XML, Microsoft Word (.DOC), Microsoft Excel (.XLS), Adobe Acrobat (.PDF), MP3 ID3v1 & ID3v2 (.MP3), and Rich Text Format (.RTF). Additional file types can be added upon request. But only documents matching user's specifications are indexed. Users can specify not only document size, document extension, directory depth, but also the domains to crawl and index. New documents and URL are indexed and searchable immediately. ES.Net also caches documents in the way similar to Google. ES.Net provides web-based search engine with users.

It supports advanced search syntax including AND, OR, NOT, NEAR, and Phrases. The search results can be sorted by Relevance, URL, or Date. The search results are cached to provide instant results for repeat searches.

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