cocos2d for iPhone is a framework for building 2D games, demos, and other graphical/interactive applications. It is based on the cocos2d design: it uses the same API, but instead of using python it uses objective-c.

A small portable laser-based projector

oFono.org is a place to bring developers together around designing an infrastructure for building mobile telephony (GSM/UMTS) applications. oFono is licensed under GPLv2, and it includes a high-level D-Bus API for use by telephony applications of any license. oFono also includes a low-level plug-in API for integrating with open source as well as third party telephony stacks, cellular modems and storage back-ends

C++ API, multiplatform (Mac OS X, iPhone, Win32, Linux), 3D hardware accelerated GUI and more...

calibre is a one stop solution to all your e-book needs. It is free, open source and cross-platform in design and works well on Linux, OS X and Windows. calibre is meant to be a complete e-library solution and thus includes library management, format conversion, news feeds to ebook conversion, as well as e-book reader sync features and an integrated e-book viewer.

Adeona is the first Open Source system for tracking the location of your lost or stolen laptop that does not rely on a proprietary, central service. This means that you can install Adeona on your laptop and go — there's no need to rely on a single third party. What's more, Adeona addresses a critical privacy goal different from existing commercial offerings. It is privacy-preserving. This means that no one besides the owner (or an agent of the owner's choosing) can use Adeona to track a laptop. Unlike other systems, users of Adeona can rest assured that no one can abuse the system in order to track where they use their laptop.

Normalized CSS & HTML framework to develop iPhone webdev applications.

PhoneGap is a development tool that allows web developers to take advantage of the core features in the iPhone, Android, and Blackberry SDK using JavaScript.

The instantreality-framework is a high-performance Mixed Reality (MR) system, which combines various components to provide a single and consistent interface for AR/VR developers. Those components have been developed at the Fraunhofer IGD and ZGDV in close cooperation with the industry.