programming languages. After 2005, there began to be a move toward increasing consolidation and standardization: many less-popular wiki applications were gradually abandoned, and fewer new applications were created. Relatively few of the wiki engines currently in use were created after 2006. Some content management systems, such as Microsoft SharePoint, have also adopted wiki-like functionality. Data compatibility In general new wiki engines have not followed the data formats (wiki markup languages) of the existing engines, making them of limited use for those who have already invested in large knowledge bases in existing software. As a rule newer wiki projects have not succeeded in attracting large numbers of users from the existing wiki software base. The most well-known data format arguably is MediaWiki's, and correspondingly has been reimplemented in other wikis: WordPress has extensions to display and edit MediaWiki-format pages, and to frame MediaWiki. Jamwiki is a MediaWiki clone in Java, that supports MediaWiki-format pages but not extensions. Other commercial projects or clones often (or have in the past) follow the MediaWiki format. BlueSpice MediaWiki is the only such software with a free version available. None of these alternatives support the extensions available under standard MediaWiki, some of which extend or alter its data format. In 2007 a project named (Wiki)Creole to create a standardized markup language for wikis was completed. As of 2022, the effort has had significant technical success, gaining support through implementation in many engines, but limited social success as it is still relatively unused and unknown, having few cross-markup conversion tools for migrating existing knowledge bases to it and no major engines using it as their native markup syntax. Types of usage There are essentially three types of usage for wiki software: public-facing wikis with a potentially large community of readers and editors, private enterprise wikis for data management by corporations and other organizations, and personal wikis, meant to be used by a single person to manage notes, and usually run on a desktop. Some wiki software is specifically geared for one of the usage types, while other software can be used for all three, but contains functionality, either in its core or through plugins, that help with one or more of the usage types. Public wikis Public wikis are usually open to the public to read, edit and comment on some or all of the article space of each wiki. Many offer registration to offer further access