 An open-source fork of Windows Live Writer was released as Open Live Writer on December 9, 2015.The software featured WYSIWYG authoring, photo-publishing and map-publishing functionality, and was compatible with Windows Live Spaces, SharePoint blogs, Blogger, LiveJournal, TypePad, WordPress, Telligent Community, PBlogs.gr, JournalHome, the MetaWeblog API, the Movable Type API, Blogengine, Squarespace, and all blogs that supported Really Simple Discovery.Windows Live Writer introduced the Provider Customization API that enables both rich customization of Windows Live Writer's behavior as well as the opportunity to add new functionality to the product.