Yahoo Widgets was originally developed as Konfabulator, by a core development team consisting of Arlo Rose, Perry Clarke, and Ed Voas. Originally released on February 10, 2003 as a Mac OS X only application which cost $24.95 (and later, with the release of version 2.0, US$19.95), its Windows version was released on November 8, 2004 with the release of version Konfabulator 1.8, and made freeware with the release of Konfabulator 2.1 on July 25, 2005, when it was sold to Yahoo. Shortly prior to this, Apple released a similar widget engine, Dashboard, as part of its Mac OS X Tiger operating system. Konfabulator's main commercial competitor on the Windows platform is DesktopX, developed by Stardock. Other programs offering similar functionality include Kapsules and AveDesk (for Windows), gDesklets (for GNOME), and SuperKaramba (for KDE).