Prepar3D Tweak Assistant for Preapr3D v3 is probably the best freeware I’ve tested this year. What it does to increase realism in the sim is simply breathtaking! Again one has to ask why Lockheed Martin can’t include a settings screen to do these lighting adjustments from within P3D without the need for third party software.
All screenshots are P3D default with freeware replacement land class textures by Adam Mills and freeware replacement sky textures from Navid. No scenery addons installed of any kind – apart from PTA tweaks!