Nokia is to support HTML5 for web apps and make the Qt systems development platform compatible with its Symbian and MeeGo mobile operating systems so that apps developed on Qt will run on both.
Nokia said the decision to focus on Qt as the sole application development framework will ensure that applications will continue to be compatible with future evolutions of Symbian as well as upcoming MeeGo products.
It said Qt offered in-built support for HTML5 as well as faster creation of rich user interfaces and visually engaging applications.
The company, which is under pressure from Android and iPhone for app developers' hearts and minds, also said it would drop the distinction between Symbian versions.
Nokia CTO Rich Green said the moves would "accelerate our ability to offer the strongest possible opportunity for developers and the richest possible experience for consumers".
The move means app developers will be able to tap into Nokia's installed base, currently estimated at around 1.3 billion.