Caffélatex tire sealant is different than other liquid latex sealants on the market -- it has a foaming agent that effectively creates a tire filling foam as your tire rolls down the road or trail. 

The advantage is that the Caffelatex foaming sealant can seal the rim/tire junction and sidewall punctures as you ride. For a sidewall puncture, other riders will have to stop and jiggle their tire. Caffelatex is a liquid, synthetic latex based tire sealant. It's ammonia-free, so it won't harm your tires, tubes or rims. It's available in a 1000ml or 250ml bottle. Caffelatex will seal punctures as big as 5mm in mountain and 3mm in road tires. "Having spent six months using several different sealants back-to-back, we can confidently say this is the highest performing one we have tried so far." - Matt Wragg - PinkBike.com 

Végétalex is a new, completely plant-based, biodegradable sealant. 

Végétalex contains no ammonia or other aggressive chemicals. It is biodegradable and totally plastic-free so it's great for the environment, long-lasting, and provides a high degree of puncture protections for tubeless, tubular and inner-tube tires.