i like eclat naturel from leonor greyl. this is also a styling product, but nothing like hair gel. it adds very little weight, doesn't harden, and your hair looks perfectly natural. it works as a good leave-in conditioner, and a little goes a long way.
there is also a pretty good leave-in conditioner by christophe robin, it's called hydratant santal and smells a bit like monsieur balmain. again, a little goes a long way. just a tiny drop for short hair.
both are very low in grease content.
i recommend asking for a sample to try before you buy, to see if it works for you. what works for me might not work for your hair-type.