Limon Engine is an open source, multi-platform and multi-threaded, 3D game engine. The engine is written in C++ and specially designed for First Person Shooter Games. It develops games for the platforms of Microsoft Windows, Linux and Mac-OS. It is a self-contained, simple learning project, has clean code and fair amount of functionalities. It is a great platform for learning game development. The engine is licensed under free LG-PL (Lesser General Public License).

In the C Programming Language, the #ifndef directive checks if the given token has been #defined earlier in the C code. If the token has not been defined earlier then it includes the code between #ifndef and #else. If no #else is present then code between ##ifndef and #endif is included.

C++17 is the next level evolution in modern C++ programming. It was officially standardized in December 2017, giving the developers a wealth of new features to write better codes. Adopting C++17 is a much easier step as adopting C++11. C++17 contains a huge number of library features and valuable language that can support and change the way we do programming in C++.

A series of game engines known as id Tech is a series designed and developed by id Software. The company behind id Tech is id Software that is part of the ZeniMax Media Inc. First few engines of the series i.e. 1, 2, 3, and 4 have been released as free software under the GNU General Public License.

Leadwerks is a cross-platform, 3D game engine developed by Leadwerks Software to make 3D video game easy to develop. It is written in C++, C-Objective and Lua. It develops games for the platform of Microsoft windows and Linux. It is a proprietary engine. On March, 2019 its first stable version was released. Until now four versions of the engine have been released.

Jade is a Cross platform proprietary game engine developed and used by Ubisoft Montpeller (a French development studio of Ubisoft). The engine is written in C++ and develops games for Microsoft Windows, Android, Atari Jaguar, PlayStation 2, PlayStation 3, Xbox, Xbox 360, Nintendo Wii etc. this engine has been developed over time to produce many popular game series.

IW Engine is a next-generation game engine employed in the highly successful series of Call of Duty. The engine is written in C, C++ and Python language. It targets the platforms of Microsoft Windows, OSX, PS3, PS4, Xbox One, Xbox 360 and Wii U. It was developed by Video Game Companies Infinity Ward Inc. and Treyarch. The engine was originally based on id Tech 3 game engine. The first version IW 2.0 was developed in 2005.

The irrLicht is a cross-platform, open-source, 3D graphics engine written in C/C++. It runs on the platform of windows, Solaris, MacOS and Linux. IrrLicht was developed by single developer Nikolaus Gebhardt in 2002. After its first release, the company was expanded up to ten developers. Its four versions have been released till 2007. It is used to develop 3D and 2D applications such as games or scientific visualizations.

Learning programming is undeniably challenging. Achieving some level of mastery requires great focus and time. This applies to students pursuing degrees in computer science, veterans who can operate the GI Bill, aspiring self-taught programmers, and coding Bootcamp students. And even as mastering programming craft remains a perpetual struggle, it is something doable.