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Create games and apps that run on eight platforms in C++: OSX, Win, iOS, Android, WebOS, RIM Playbook, Linux, Flash

Entire engine based on GL (OpenGL ES 1.X or GL 1.3)

In App Purchase integrated for iOS, Android, and webOS through a single interface (IAPManager)

Third party systems integrated: Tapjoy, Hooked, Chartboost, Startapp, Flurry

System specifics are abstracted, hiding the gotchas and caveats of each platform, while still harnessing the full power of the native hardware (for instance, hardware audio decoding)

Sigslot based (with boost::signals) messaging system that lets you dynamically schedule calling entity and component functions, set variables

Supports fake screen resolutions with stretching, so you can target only a few sizes and automatically scale up/down to the closest one

Internal component based GUI system with menus, buttons, scrolling, text input (supporting hardware and soft keyboards)

2D and 3D Particle system (LinearParticle for 2d, and Irrlicht for 3D)

Font system supporting in-line coloring, kerning, scaling, wrapping. Imports BMFont generated fonts.

Simple to use AudioManager with smart caching, streaming, and per sfx controls. (Supports 6 implementations)

Portrait and landscape modes support with rotation/flip (on some platforms)

Automatic internal handling to seamlessly deal with power-of-2 texture limitations

Socket and HTTP classes, in-game file downloading

Powerful 2D image handling with scaling, tinting, rotation, animation

FileManager that transparently handles decompressing files when needed, supports mounting zips as filesystems, automatically mounts Android .apks

Get abstracted input from touch, mouse, DInput, iCade, Xperia gamepad, 60Beat Gamepad, accelerometer

RTPack command line tool intelligently handles image conversions to .rttex format, a wrapper that handles multiple formats including jpg and powerVR compression types

Requires minimum outside dependencies for portability, most are included (such as libjpg, libpng, a small subset of boost, etc)

Large group of cross platform utility functions suitable for stealing if you want (Such as RemoveDirectoryRecursively, CreateDirectory Recursively, LaunchURL, etc)

Supports premultiplied alpha, can optionally convert on load

Separate “system” and “game” timers make pausing the game easy

Built-in database system (VariantDB) can serialize key/data pairs to/from disk or raw memory easily

All C++ source is “right there” making debugging easier - don't know how to use a component? Look at its source

3D features provided by the optional pre-integrated Irrlicht component - Proton SDK doesn't use any of its window setup or input code, but only the rendering pieces

Liberal open source license

Used in the games Dungeon Scroll, Mind Wall, Blip Arcade, Dink Smallwood HD, Tanked (Free 3d game), and Growtopia.

Even if you don't plan on selling a desktop version of your game, having a native desktop binary makes it a breeze to debug and record high speed movies of your app for promotion purposes

No messy C++ hierarchy - Only a single entity type that lets you add components and additional entities as children

No hard-coded Render or Update functions, a very different way to think about and use entities

Loose coupling, can call functions, get/set variables without knowing anything about the entity/class - directly or scheduled

Dynamic creation and runtime binding of function and variables. Supports reflection, remote procedure calls, tweening

Components can share data and work together - for example, adding the RenderTrailComponent will add a 'trail' without knowing anything about the component (s) that is actually handling rendering

Can request callbacks when data is changed or functions are called

You can just ignore the entire entity system if you want, or just use it for your app menus/GUI