I wondered about the Ragnarok client open source, and here's what I found on the Internet:
Open Ragnarok Client Source
And the video with a demonstration of his work:
I hope this information is useful to the community and developers emulator.
Hi all, I am a long time thinking about it and finally made a decision.
Source code of patcher except for the library to work with the GRF will be available in SVN or GitHub.
I also continue to develop and support patcher.
Link to github: Patcher