adding warmth and clarity etc to music

[BloodStar]

appart eq, compressor, reverb which are the most importnat tools. you can add some soundshaping fx. modulation plugins are excellent for creating spacey spatial FXing. you're probably looking for some sort of saturation tool. tape saturation, tube saturation/overdrive. depends on the context and if you want mild or brutal kind of saturation.

you can try Ferric from infamous developer Bootsy or any kind of "warmifier". most important, be careful to not overdo. some people use white noise sampled from analog machines and mix it in to original sound, when used subtly sounds become more organic.

for normal saturation, you cant go wrong with IK Amplitube, plugins from D16, Antares Tube, etc. go search KVR, you will find plenty.

for brutal saturation you can try any bit crushing plugin or twist above mentioned to extreme settings.