This is WinForms wrapper (including System.Drawing). Here you can create base controls and make your own custom controls. The reason why I made it? Because now I can quickly create GUI through the code. But, yeah, right now there is a poor implementation of interaction with the editor.

• Button;
• CheckBox;
• ComboBox;
• DateTimePicker;
• Form;
• GroupBox;
• HScrollBar;
• Label;
• LinkLabel;
• ListBox;
• MenuStrip;
• MonthCalendar;
• NumericUpDown
• OpenFileDialog;
• Panel;
• PictureBox;
• ProgressBar;
• RadioButton;
• SaveFileDialog;
• TabControl;
• TextBox;
• Timer;
• ToolStrip;
• ToolTip;
• TreeView;
• VScrollBar;

Other controls:

• BitmapLabel;
• ColorPicker;
• RepeatButton;
• TableView;

1. Attach UnityWinForms script to GameObject;
2. Add Arial font to resources;
3. Add other fonts and images;
4. Create Form control in your MonoBehaviour script;

public class GameGuiController : MonoBehaviour
{
	void Start()
	{
		var form = new Form();
		form.Show();
		
		// Or show a message.
		// 		MessageBox.Show("Hello World.");
	}
}