Most heavy conditioners would if you left some in instead of rinsing completely -- Regis Design Line Olive Oil, Paul Mitchell The Conditioner, Curl Junkie Healthy Condition, Elucence MBC, Curls Milkshake, etc. Kinky Curl Curling Custard devolumizes, too.
I use the vanilla mint "clarifying" conditioner for CO-washes and I like it a lot. It actually makes my hair feel clean AND moisturized after using it. I then CO with Nature's Gate hemp conditioner and rinse it all out.