There's also this Polish (startup? company? hard to say) Elementa Critica Sp. z o.o. They are basing on microbes discovered in one unusually safe coal mine in Poland - these bacteria eat methan and produce ectoine among other things, and the company attemp to use them on industrial scale (they already have patented process to isolate the ectoine from grown bacteria).
Neat! We hadn't heard of them. There are a handful of companies using natural methanotrophs (methane-eating bacteria) to make chemicals. We hope that moving methanotroph enzymes into the standard industrial strains of bacteria and yeast will open up many more applications for these amazing enzymes.
http://scienceinpoland.pap.pl/en/news/news,400629,polish-ect...