FlightGear v.2020.3.5 [Linux Native]
System requirements : ОS: Linux
Processor: At least a quad core processor with ~ 2 GHz each, 64 bit architecture
Memory: At least 2-4 Gb free RAM (and more is better: when building/buying a new system, consider 6-8gb total the absolute minimum these days).
Graphics: 3D video card (with AMD or NVIDIA chipset) with support for OpenGL 2.1 or better and at least 1024-2048MB of dedicated DDR3+ (DDR5 preferred) VRAM (i.e. 512 Mb VRAM minimum)
Storage: 5 GB available space
Other: Generally, if you want to see frame rates in the 20's and above and medium/high graphical settings, which is typically preferred, you should have a budget of at least $1000.
Description : The goal of the FlightGear project is to create a sophisticated and open flight simulator framework for use in research or academic environments, pilot training, as an industry engineering tool, for DIY-ers to pursue their favorite interesting flight simulation idea, and last but certainly not least as a fun, realistic, and challenging desktop flight simulator. We are developing a sophisticated, open simulation framework that can be expanded and improved upon by anyone interested in contributing.
There are many exciting possibilities for an open, free flight sim. We hope that this project will be interesting and useful to many people in many areas.

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