FlexWiki is an open source wiki engine written primarily by David Ornstein. The engine is licensed under IBM's Common Public License. FlexWiki uses .NET technology and has an integrated, scripting language called WikiTalk. WikiTalk is based on the Smalltalk programming language (hence its name). It is a simple object oriented language that allows users to add dynamic behaviors to their topics. Along with Windows Installer XML (WiX) and Windows Template Library (WTL), FlexWiki was the third Microsoft project to be distributed via SourceForge. The code was released in September 2004.