Mark (Avon spinoff) makes a silicone-free serum. I like it ok, but actually liked the curl cream better for smoothing out dry (meaning not wet) hair. The curl cream DOES have silicones but the serum does not.
In general, no to serums, I like things that are, well, heavier, that add substance to the hair and sort of weigh it down a little, that feels good to me and looks better.
2c / C / iii (FIA)
Med-Coarse, LowPorosity, NormalElast (LCLF)
Wash: DevaCare Low Poo
Detangle & Rinseout: Walgreens or Sally's Conditioning Balm (always)
Leave-in: DevaCare OneC (budget choice is GFTN)
Style: ReCoil & DevaCare Arc Angel (budget choices are HESMU or Got2BSpikedUp)