Trolltech GreenphoneIt pays to look back before looking forward and Trolltech's Greenphone - which debuted in 2006 - was an important step in the open source mobile movement as it claimed to be the first fully reprogrammable Linux phone.
Despite being a handset that was only offered to developers and with only around 1,000 devices made before it was discontinued, Trolltech's dream of a flourishing Linux ecosystem has surely been successful - albeit not necessarily in the way it originally envisaged.
Three years on from the advent of Greenphone and mobile Linux is in rude health, thanks in large part to Google's Android OS.
Trolltech is now known as Qt Development Frameworks and concentrates its efforts on its Qt graphical toolkit software.
Credit: David Meyer/ZDNet UK