Yes, KooRaRoo now has a free version, so that you can enjoy using the best DLNA media server and organizer completely free!
It has less features than the paid version, but it's enough for everyday streaming if you are just starting out and want to try things out. Of course the paid version has a fully-functional no-obligations 30 days trial period too, so this gives you complete freedom over how you wish to try things out.
To see the difference between the versions, please see this features comparison page.
I hope you enjoy using either version of KooRaRoo and spread the good word about it, so that others benefit from the rich set of easy-to-use features that KooRaRoo has.