Sol is a labour of love and a wonderful gift to Assetto Corsa players. It improves and expands the game's functions, making it easy to set up a race and save the starting rules, grids and weather conditions for next time, or to change them with a click of a button. Its clever programming squeezes the utmost performance out of Assetto Corsa and my PC. As for the graphics, there have been numerous times when the beautiful and atmospheric lighting has made my jaw drop like a broken front splitter.
A word of warning: pay close attention to the installation procedures. If you're nervous about installing this mod, @peterboese is very active on RaceDepartment and in the Sol Discord, patiently answering queries. If you play AC, install Sol; it's that good. Don't forget to donate, review or say thank you. :)