Open Programming Language

Open Programming Language (OPL) is an embedded programming language for portable devices that run the Symbian Operating System.

It can be found on the Nokia 9200, 9300 and 9500 Communicator series mobile telephone/personal digital assistant (PDA) and the Sony Ericsson P800, P900, P910 series. On classic Psion PDAs such as the Series 3, 5/5mx, Series 7, and netBook/netPad, as well as the MC218, OPL is part of the standard application suite. OPL is also included in Psion Teklogix industrial handhelds such as the Workabout mx. OPL is an interpreted language similar to BASIC. A fully Visual Basic-compatible language OVAL has been also developed.

The language was originally called Organiser Programming Language, developed by Psion Ltd for the Psion Organiser. The first implementation (without graphics) was for the original Psion Organiser (now referred to as the Psion Organiser I, 1984), and it came bundled with the Science, Finance and Math data packs. It became truly accessible as built-in software in the Psion Organiser II (1986), and the language went on to be used in the Psion Series 3 and later. After Psion retired from the portable digital assistant market, the project was delayed until 2003, when the fledgling Symbian Developer Program released it as open source. The language is now developed on SourceForge in the opl-dev project.