auth_ldap is an LDAP authentication module for the Apache Web server. Auth_ldap has excellent performance, due to its use of aggressive client-side caching algorithms. It also has support for LDAP over SS or TLSL. It also features a mode that lets Microsoft Frontpage clients manage their Web permissions while still using LDAP for authentication.
This C code module gives the Apache 1.3.x HTTP server the ability to correctly negotiate content types for XHTML documents. Currently these are sent as text/HTML for most Web sites. This gives maximum compatibility among older Web clients, but is not recommended practice according to the W3C.
Douglas Thrift's Search Engine is an indexing search engine for use on small Web sites such as personal or small business sites. It is designed to be very similar to Google for end users and its output is customizable. For indexing, it supports both the Robots Exclusion Protocol and the Robots META Tag.
4Suite XML is a Python-based toolkit for XML application development. It features a library of integrated tools for XML processing, implementing open technologies such as DOM, SAX, XPath, XSLT, XInclude, XPointer, XLink, XUpdate, RELAX NG, and XML/SGML Catalogs. The RDF and Repository components of 4Suite are separate packages that must be installed separately, on top of 4Suite XML.