Facilities and software features of Professional Unity:
-Visual attractive and user-friendly environment
-Mono powerful software for editing programming languages
-Support for programming languages ​​C #, javascript, and Boo
-Ability to import the output of three-dimensional design software such as 3ds Max, Maya, Blender, etc.
-There are a variety of Shader, effects and visual effects High Definition
-High-speed rendering operation
-Full simulation and advanced types of terrain, weather, automotive and ...
-nVIDIA PhysX engine to simulate physical, speed, friction, impact, etc.
-take advantage of new technologies lighting and shading for moving objects

System Requirements:

For development:
-OS:Windows 7 SP1+,8,10,64-bit versions only
Server versions of Windows & OS X are not tested.
-CPU:SSE2 instruction set support.
-GPU:Graphics card with DX10 (shader model 4.0) capabilities.

The rest mostly depends on the complexity of your projects.
Additional platform development requirements:
-Android:Android SDK and Java Development Kit (JDK); IL2CPP scripting backend requires Android NDK.
Universal Windows Platform: Windows 10 (64-bit), Visual Studio 2015 with C++ Tools component or later and Windows 10 SDK

Home page - https://unity.com/