I have about 50 old window sashes, there are 4'x3' 8 pane, 3'x2' two pane and other sizes. All are painted and in good condition.
I don't know what to do, as I can't just throw them away...

They are probably 80-100 years old, perfect wood for someone who restores/repairs old wooden windows.

Contact me if you are interested and I'll send you some pics - ZIP 06360