There is a free tool for windows machine, CocoStudio .
The default language is Chinese, however, you could switch to English when launching.
Please install the full version when you use it first time.
I’ve been waiting for CocoStudio’s english version since I first heard of it’s existance 11 days ago here:
But I thought that the english version wasn’t ready yet! I’ll go ahead and download the full package on that site then!