Are there any followers of Catharism today? I'm interested by Catharism. Is there anywhere in Christendom where this faith has reappeared since being suppressed in the Middle Ages?

I know that today some people in France, near Spain, are called Cathars, because they are living on the territory where the Cathars lived.  But, from what I know, there are no believers in Catharism there.
Full followers of Catharism were known as 'Perfects'. They would commit to a specific ascetic lifestyle, and would on their death ascend to heaven. Other lesser followers of Catharism would be reincarnated to get another chance.

Unfortunately to be a Perfect, you need to be inducted by another Perfect. Since there are no more Perfects, no-one can become one. The last leader of the Cathar movement fully admitted that he was not a full Perfect, because no Perfects remained to induct him. Therefore Catharism has effectively died out. 

The Perfect Heresy by Stephan O'Shea is a good book for those wanting to know more.