Xapian is a search engine library, scalable to collections containing hundreds of millions of documents. It's written in C++ with bindings for Perl, Python, PHP, Java, Tcl, C#, Ruby, and Lua. It is a highly adaptable toolkit that allows developers to easily add advanced indexing and search facilities to their own applications. It supports the Probabilistic Information Retrieval model and also a rich set of boolean query operators. Omega is a Web search application built upon the Xapian library. It can index a Web server's document tree (including HTML, PDF, OpenOffice, MS Word/Excel/Powerpoint/Works, WordPerfect, RTF, PS, etc.), or data exported from arbitrary sources (e.g. SQL databases).
DotNetWikiBot Framework is a full-featured client API with a console interface that allows you to build programs and Web robots easily to manage information on MediaWiki-powered sites. DotNetWikiBot Framework is intended to help with many complicated and routine tasks of wiki site development and maintenance. Any .NET language can be used to access DotNetWikiBot library functions. Only minimal programming skills are required to make bots with DotNetWikiBot Framework.