Puralytics is one that the Rainbow Water Coalition has posted on before, here, here, and here. I met the principal Mark Owen of the firm at BEST-FEST in Portland this past fall, where in addition to showcasing their great greywater treatment products, they also introduced the SolarBag 3L Reusable Sunlight Activated Water Purifier. This has a real future in many disadvantaged countries as well as recreational camping. I hope they sell many - it is a cool idea.
Vorsana is a new name to me. They apparently use radial counterflow solutions to deal with methane, mercury and cyanide in wastewater among many other applications. This process looks like a winner given the lack of membranes.