Unit 70 P1 and P2 

App game kit.
is a cross platforming in Android ios mac and PC.
this engine give coders the chance to write open scripts results can be created in minutes or
customise to very specific needs.  The engine’s primary user base tends to be hobbyists. The Game Creators CEO Lee Bamber says they have built an enthusiastic forum community around AGK. This is a open user use so this means the public can use it.   

Bigworld.
is used for war-gaming on browers and PC for games like World of Tanks, Grandia Online, Heroes: Scions of Phoenix, Moego, Realm of the Titans  
Solid user client and state-of-the-art backend are what attracted attention to BigWorld Technology, says War-gaming, the fast-moving online games company which purchased the middle-ware provider last year.

BigWorld is built to support MMOs. Currently, it can be used to create PC and browser games, though inseparability for other platforms is planned.The BigWorld engine famously powers War-gaming's runaway hit World of Tanks, and is now being used to build spin-offs, World of Warplanes and World of Warships. 
Bigworld is a open user use also.

Biltztech 

is used in 3DS, Android, iOS, Linux, Mac, PC, PS3, PS Vita, Wii, Wii U, Xbox 360 this engine has been used in game such as House of the Dead: Overkill, Rayman Raving Rabbids, Puss in Boots, Kumo Lumo, Vitalize. 

BlitzTech’s versatility is demonstrated by the platforms it supports and its uses. Maker Blitz Games has used the engine in Kumo Lumo on iOS, and the same tech powers its Kinect-enabled rehabilitation aid Vitalize.

The engine has a broad set of audiovisual tools, real-time physics, AI and multi-core capabilities to make cross-platform production less gruelling.

Blitz Games technical director Tony Povey says it focuses on quality from the first prototype right through to areas of increasing importance, such as post-launch support, including social features, web services and analytics.

This year, it will be switching to an HTML 5 interface, adding improved support for different genres and closer integration with the likes of Maya.
Biltztech is a open user use also.

 In-house tech 

The creation engine is a collection of in-house tech and middle-ware tools developed based on the gamebryo iteration used for the fallout franchise and skyrim Bethesda honed or replaced every major system powering the game-play experience however retaining compatibility using exactly the same file architecture of the original Gamebryo and Netlmmerse engines as well as the cell based game-world.

Unreal

The Unreal Engine is a game engine developed by Epic Games, first showcased in the 1998 first-person shooter game Unreal. Although primarily developed for first-person shooters, it has been successfully used in a variety of other genres, including stealth, MMORPGs, and other RPGs.

unreal has made games such as brother in arms, bioshock and Americas army.

frostbite
Frostbite is a game engine developed by EA Digital Illusions CE , the creators of the Battlefield series. The engine currently is designed for use on Microsoft Windows, PlayStation 3, PlayStation 4, Xbox 360, and Xbox One platforms and is adapted for a range of video game genres.

On there website this is the overview of the next generation in game design on the newest engine frostbite 3.
"A great game engine today has to support all the latest features, but also do it within an efficient and flexible framework that can grow and adapt in the ever-changing and competitive world of games".

Gamemaker