1st one is most important - Widescreen fix
Breakable Windshields - as a name , allows u to kill by breaking window as in vc/sa
Burstable Tyres - same , this mod requires to change some blank audios of game to have a burst tyres sound
and final one is Skygfx the mod which adds car real time reflections, it also adds gloss for roads, reduces alpha bugs, adds water droplets on rainy weather and many more
so these mods will do more experienced gameplay features and adds some graphic enhancements
There is a plenty other cool mods like Silent Patch, skin n bones, Project2DFX, ClassicAXIS , but they are not so important as a list above