I have searched and found the following controls wich are free of charge, these controls are free and some of them i'm using for long time.
The first in my list is component factory's Krypton Toolkit which contains very high quality controls for winforms as you can see.
Second offer that i have been using is 60 of devexpress controls.
My third link is new to me and i haven't tried much these controls but they look very nice and include source code with them, so i leaving you with some test here openwinforms.com
9379e02f-fdf8-469d-8d66-f93f9fe3fa86|1|5.0
Programming
free controls, component factory, krypton toolkit