Look at what Keynes said:

"Gesell's chiefwork is written in cool and scientific terms, although it is run through by a more passionate and charged devotion to social justice than many think fit for a scholar. I believe that the future will learn more from Gesell’s than from Marx’s spirit."

And for austrians...What if Keynes was right twice (apart from "In the end we're all death")?
Gesell seems pretty libertarian to me in most of his thoughts.