mypiano_jukebox is one of the best free open source standalone virtual piano midi folder player for now , unless it is copyied .
harp0 - harp9 + piano shape selection
link => https://sourceforge.net/projects/mypiano-jukebox/
video https://www.youtube.com/watch?v=Ug7LvAGAW9E
https://www.youtube.com/watch?v=MGuS5Vfjxt0
