FileMaker Pro is a cross-platform relational database application from FileMaker Inc., formerly Claris, a subsidiary of Apple Inc. It integrates a database engine with a graphical user interface (GUI) and security features, allowing users to modify the database by dragging new elements into layouts, screens, or forms. Current versions are: FileMaker Pro 15, FileMaker Pro Advanced 15, FileMaker Server 15, and FileMaker Go 15 for iPhone and iPad. FileMaker evolved from a DOS application, but was then developed primarily for the Apple Macintosh and released in April 1985. Since 1992 it has been available for Microsoft Windows and for the classic Mac OS and macOS, and can be used in a cross-platform environment. FileMaker server briefly ran on Linux, but Linux support was abandoned with FileMaker 7, and the server currently runs only on Windows or OS X servers. A client version was released for iOS devices in July 2010. It is available in desktop, server, iOS and web-delivery configurations. FileMaker began as an MS-DOS–based computer program named Nutshell - developed by Nashoba Systems of Concord, Massachusetts, in the early 1980s. Nutshell was distributed by Leading Edge, an electronics marketer that had recently started selling IBM PC-compatible computers.