The Sony MEX-GS600BT's App Remote function is not very useful without a dashboard mount for your phone, but everything else about this full-featured car stereo makes it easily recommendable.
Automatic Labs Automatic
The Automatic driving assistant helps drivers who know nothing about cars to monitor and boost their fuel efficiency with plug-and-play ease and a simple interface that even laymen can understand.
Parrot Asteroid Smart
The Parrot Asteroid Smart is a smartly designed and flexible multimedia receiver that hangs its hat on an app market that, for now, doesn't offer much choice.
Although an interesting idea in automatically updated portable storage, the Automatica's functionality is easily duplicated on a smartphone.
Pioneer DEH-X9500BHS CD receiver
The Pioneer DEH-X9500BHS packs in a remarkably wide range of audio sources for a single-DIN receiver, including some rudimentary app integration.
Clingo Universal Car Phone Mount
The Clingo Universal Car Phone Mount would be an excellent smartphone mount if not for the need for frequent cleaning.
Pioneer AppRadio 2 ( SPH-DA100)
For iPhone 4 and 4S lovers, the Pioneer AppRadio 2 is possibly the best aftermarket receiver that money can buy. For Android users, the choice isn't so obvious.
Satechi SCH-121 Cup Holder Mount for Smartphones & Tablets
Depending on the position and nature of your car's cup holders, the Satechi SCH-121 Cup Holder Mount is a reasonable alternative to windshield-mounting a tablet.
Griffin AirCurve Window Mount
The Griffin AirCurve Windshield Mount is low-tech, but high-quality, noticeably boosting the volume of a cradled iPhone's speaker.
Grooveshark Bluetooth Car Kit for Android ( by Livio Radio)
The Grooveshark Bluetooth Car Kit isn't the best hands-free calling option and its app integration needs finessing, but the hardware is an easy way to bring Internet radio and smartphone audio playback to almost any car.