DotNetBar
DotNetBar in my opinion is very overused, but contains a lot of great looking controls to make your program look nice.
http://www.devcomponents.com/dotnetbar/
Nevron
Nevron .NET Vision is personally one of my favorite UI suites. It contains many great UI controls and much more.
http://www.nevron.com/
Syncfusion
Syncfusion Essential Studio is very much like DotNetBar, but has a lot more controls to choose from.
http://www.syncfusion.com/
Telerik
Telerik RadControls for Windows Forms has many stylish UI controls and many other components.
http://www.telerik.com/products/winforms/overview.aspx
ComponentOne
ComponentOne Studio for WinForms is a set of very useful and stylish UI controls and various other tools that are useful for multimedia needs.
http://www.componentone.com/SuperProduc ... oWinForms/
Infragistics
Infragistics .NET Advantage Controls are truly cutting edge components and can give your program an incredible UI.
http://www.infragistics.com/dotnet/neta ... forms.aspx
Xceed
Xceed Components are mainly known for their code operations. It can do very comprehensive actions that are very useful. It also has a small set of UI controls that have options no other suite has.
http://xceed.com/US_Suite_Intro.html
SandDock
Divelements SandDock are docking panels that are very useful, user friendly, and stylish.
http://www.divil.co.uk/net/controls/sanddock/
SandRibbon
Divelements SandRibbon has a small Ribbon tool set like the Office 2007 Ribbon.
http://www.divil.co.uk/net/controls/sandribbon/
SandGrid
Divelements SandGrid contains TreeViews that are very unique.
http://www.divil.co.uk/net/controls/sandgrid/
Well, that's all I have for you guys at the moment. Enjoy! I want to see some good looking programs come out soon!
And if you know of any more UI suites that are not listed, please post and tell me and I will update this post.
