• Digital Information Gateway (DIG), an advanced information sharing and retrieval solution for searching database servers, documents, web pages, and e-mail servers from a common user interface.
• Information Crawler, provides free information retrieval tools and services.
• mnoGoSearch, a full-featured Open Source search engine for Internet sites and Intranet.
• MyNet - Anywhere, collect data and information from the Internet and store it in a structured form on the individual user's machine.
• Navagent Surf3D, provides smart web search, visualization, and more.
• Sav Z Server, Web-based object-relational database server implemented in JavaTM. Free Download!
• SearchUnit, Provides an index based search engine for ASP.NET web applications, websites and content management systems.
• Quintura Search offers a visual map of tags or hints contextually related to your search query.
• Web DataBase Connectivity, allows standard SQL queries against web pages

Related

• Web Usage Mining software
• Web Content Mining software