"DCSFlightpanels primary use is for using Saitek/Logitech panels and Stream Deck in DCS World.
Together with DCS-BIOS you can manage every control for the aircraft and use the Radio Panel to operate cockpit radio equipment and also show data from the aircraft in the Multipanel & Backlit Panel. Using DCSFlightpanels as a key emulator it can be used in almost any game like Elite Dangerous, War Thunder, Flaming Cliff Series, IL-2."
WineD3D For Windows is a DirectX 1-11 to OpenGL wrapper based on WineD3D, which is an almost full implementation of DirectX used in Wine.
Even if Windows supports DirectX natively, using WineD3D can enhance backwards compatiblity with older games, especially on Windows 8 and newer that don't support 16 bit screen modes. Another possible use is to emulate unsupported versions of DirectX, or porting DirectX applications to OpenGL without having to rewrite the rendering code. Please note that WineD3D is far from perfect, and many games will not work.