These are by no means the only ones available but having prior experiences with these companies’ products recommendation integrity is high. Qihoo 360 claims to be the first security vendor to release a data/file recovery tool against WannaCry/WanaCrypt0r. The article is quite detailed and a link to the tool can be found approximately two-thirds down under Chapter 3 Feasibility of Data Recovery. It should be noted that 100% recovery can not be guaranteed due to the malware’s destructive nature.
Avast makes available a nice tool set of decryptors including updates to recently discovered strains of the CrySis ransomware. I also highly recommend the blogs of these two companies as a great, cyber security news sources. Happy and safe computing.