These samples use the Tao Framework for OpenGL on .NET and Mono.

//cube.boo
//when compiling with booc, add references to
//Tao.OpenGl.dll and Tao.FreeGlut.dll
//You may need to find a build of the freeglut.dll.  I don't
//know where such a build is now.

import Tao.FreeGlut
import Tao.OpenGl

def Init():
	Gl.glClearColor(0.0, 0.0, 0.0, 0.0) //floats
	Gl.glShadeModel(Gl.GL_FLAT)

def Display():
	Gl.glClear(Gl.GL_COLOR_BUFFER_BIT)
	Gl.glColor3f(1.0, 1.0, 1.0) //floats

	// Clear the matrix
	Gl.glLoadIdentity()

	// Viewing transformation
	Glu.gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)

	// Modeling transformation
	Gl.glScalef(1.0, 2.0, 1.0) //floats

	Glut.glutWireCube(1.0)
	Gl.glFlush()

def Keyboard(key as byte, x as int, y as int):
	if key == 27:  //escape key
		System.Environment.Exit(0)

def Reshape(w as int, h as int):
	Gl.glViewport(0, 0, w, h)
	Gl.glMatrixMode(Gl.GL_PROJECTION)
	Gl.glLoadIdentity()
	Gl.glFrustum(-1.0, 1.0, -1.0, 1.0, 1.5, 20.0)
	Gl.glMatrixMode(Gl.GL_MODELVIEW)


Glut.glutInit()
Glut.glutInitDisplayMode(Glut.GLUT_SINGLE | Glut.GLUT_RGB)
Glut.glutInitWindowSize(500, 500)
Glut.glutInitWindowPosition(100, 100)
Glut.glutCreateWindow("Cube")
Init()
Glut.glutDisplayFunc(Display)
Glut.glutKeyboardFunc(Keyboard)
Glut.glutReshapeFunc(Reshape)
Glut.glutMainLoop()

/*
nehe.boo

Requires boo: http://boo.codehaus.org/
and the Tao OpenGl Framework: http://www.mono-project.com/Tao

Compile using the booc compile line tool:
booc.exe -r:Tao.OpenGl.dll -r:Tao.OpenGl.Glu.dll -r:Tao.Platform.Windows.dll -out:nehe.exe NeHe.boo
*/

namespace NeheTest

import System
import System.Windows.Forms
import System.Drawing
import System.ComponentModel
import Tao.OpenGl
import Tao.Platform.Windows

private class MainForm(Form):
	private components as Container = null
	private glControl = SimpleOpenGlControl()

	def constructor():
		InitializeComponent()

	def InitializeComponent():
		SuspendLayout()
		glControl.Location = Point(0, 0)
		glControl.Dock = DockStyle.Fill
		glControl.Visible = true
		glControl.KeyDown += HandleKeyDown

		Controls.Add(glControl)

		//the "self" is always optional:
		self.AutoScaleBaseSize = System.Drawing.Size(5, 13)
		self.ClientSize = System.Drawing.Size(292, 273)
		self.Name = 'MainForm'
		self.Text = 'NeHe Boo Example'
		ResumeLayout(false)

	protected override def OnLoad(e as EventArgs):
		super(e)
		InitGL()

	protected override def OnResize(e as EventArgs):
		super(e)
		ResizeGL(glControl.Width, glControl.Height)

	def Run(): //main loop
		while Created:
			Invalidate(true)
			DrawGL()
			Application.DoEvents()

	protected override def Dispose(disposing as bool):
		if disposing:
			if components != null:
				components.Dispose()
		super(disposing)

	private def HandleKeyDown(sender, e as KeyEventArgs):
		if e.KeyCode == Keys.Escape: //char type will be in boo soon
			Close()

	private def InitGL():
		glControl.InitializeContexts()
		OnResize(null)

	private def ResizeGL(w as int, h as int):
		Gl.glViewport( 0, 0, w, h)
		Gl.glMatrixMode ( Gl.GL_PROJECTION )
		Gl.glLoadIdentity()
		Glu.gluPerspective( 60.0, cast(double,w) / h, 1.0,1000.0)
		Gl.glMatrixMode ( Gl.GL_MODELVIEW )
		Gl.glLoadIdentity()

	///////////////////// Drawing code ///////////////////////////
	private _lastMs = 0
	private _angle = 0.0

	private def DrawGL():
		if _lastMs == 0:
			_lastMs = DateTime.Now.Ticks

		currentMs = DateTime.Now.Ticks
		//int division will change from / to \ in future:
		milliseconds as long = (currentMs - _lastMs) / 10000
		_lastMs = currentMs
		Gl.glClear(Gl.GL_COLOR_BUFFER_BIT | Gl.GL_DEPTH_BUFFER_BIT)
		Gl.glLoadIdentity()
		Gl.glTranslatef(0, 0, -6)
		Gl.glRotatef(_angle, 0, 1, 0)
		rot1 = 0
		while rot1 < 2.0:
			Gl.glRotatef(90, 0, 1, 0)
			Gl.glRotatef(180, 1, 0, 0)
			rot2 = 0
			while rot2 < 2:
				Gl.glRotatef(180, 0, 1, 0)
				Gl.glBegin(Gl.GL_TRIANGLES)
				Gl.glColor3f(1, 0, 0)
				Gl.glVertex3f(0, 1, 0)
				Gl.glColor3f(0, 1, 0)
				Gl.glVertex3f(-1, -1, 1)
				Gl.glColor3f(0, 0, 1)
				Gl.glVertex3f(1, -1, 1)
				Gl.glEnd()
				rot2 += 1

			rot1 += 1

		Gl.glFlush()
		_angle += milliseconds / 5.0


////////////// main part of script ////////////////////
res = MessageBox.Show(null, 'Would You Like To Run In Fullscreen Mode?',
                           'Start Fullscreen?',
			   MessageBoxButtons.YesNo,
			   MessageBoxIcon.Information )
form = MainForm()
if res == DialogResult.Yes:
	form.FormBorderStyle = FormBorderStyle.None
	form.Location = Point(0, 0)
	form.Size = Screen.PrimaryScreen.Bounds.Size

form.Show()
form.Run()