As interest in Virtual Reality technology has increased now days. There are so many tools and OS available to the developer to develop the Virtual Reality application. There are many tookits and other frameworks are available to development environment, integrating.

Each of the These development systems has a unique set of feature. There are not yet any standards for VR software.

Before deciding which development system is best suited to a particular application, the developer needs to know what questions to ask. This includes knowing what capabilities are required to implement the application and how to tell which systems meet those requirements.

There are three primary requirements for a VR development system:

Effective environments need a high frame rate (70 Hz or better) and low latency. Poor performance is not merely an inconvenience for the end user; it can cause unpleasant side effects including disorientation and motion sickness Therefore, a VR system should be able to take advantage of all available resources on a system, such as processors and special graphics hardware. The development system itself should have as little overhead as possible, letting the hardware run at its maximum efficiency.

The development environment should be able to adapt to many hardware and software configurations. If the environment cannot adapt to new configurations, applications will be limited in the scope of their usefulness. A developer should not be required to rewrite an application for every new configuration.In addition, the design of the system itself should not limit the sort of applications that can be developed with it. Developers should never hit a wall where the development environment restricts them from creating an application that works the way they have envisioned it.

The development system should be easy to configure and to learn. The Application Programming Interfaces (APIs) and/or languages used to create applications should be cleanly designed and should hide as much of the system’s underlying complexity as possible.

Many toolkits are available on two or more platforms, so it is important to consider present and future porting of applications when choosing the base for a development effort. Well-designed toolkits should hide platform-specific details well enough that porting an application between different platforms with the same toolkit requires little or no change in the application. For toolkits that use their own data formats and scripting languages, it is often the case that no changes are necessary. On the other hand, toolkits where the developer writes his or her own code in a language like C++ are subject to all the usual headaches of porting source code. A well designed VR development environment should help make this porting simple.

What kind of special VR hardware is the application designed to use? Is it simple enough to use a joystick or wand for user input, or will a glove make it easier to control or VR head-mounted display?; It is also possible to work the other way around – design the application first, then buy the hardware best suited for it. In addition to immediate needs, future plans should be considered – will a glove or some kind of haptic output device be available in the foreseeable future? If so, perhaps they should be added to the list of hardware devices that must be supported.

In order to create VR games or other interactive VR content we have many applications which available open source. Most popular and cross platform software is Unity which has multiple features.

To make development faster, secure and automate we use the Jenkins.

Unity is a fully integrated development engine that provides rich out-of-the-box functionality to create games and other interactive 3D & VR content. You use Unity to assemble your art and assets into scenes and environments; add lighting, audio, special effects, physics and animation; simultaneously play test and edit your game, and when ready, publish to your chosen platforms, such as Mac, PC and Linux desktop computers, Windows Store the Web, iOS, Android, Windows Phone 8, Blackberry 10, Wii U, PS3 and Xbox 360.

Unity’s complete toolset, intuitive workspace and rapid, productive workflows help users to drastically reduce the time, effort and cost of making interactive content.

Jenkins is an open-source continuous integration software tool written in the Java programming language for testing and reporting on isolated changes in a larger code base in real time. The software enables developers to find and solve defects in a code base rapidly and to automate testing of their builds

As Unity3d is multi-platform, you may need to install the proper third party OS & tools (Android SDK, XCode, etc) depending on the type of build targets you intend to exercise.

In order to develop a Virtual reality application, we need to work on per-requirements. As we need a higher configuration system with Graphic card and higher system. To secure the  code, design and make the automate we use open source software which help to developers.