GRF Editor
http://rathena.org/board/files/file/2766-grf-editor/
 
Tortoise SVN
http://rathena.org/board/topic/56594-guide-svn-checkout-using-tortoise-svn/
 
Microsoft Visual Basic 2010
http://www.microsoft.com/en-us/download/details.aspx?id=23691