http://paperpcb.dernulleffekt.de/doku.php?id=vga_synthesizer:vga_breakout_board

… and how to build the connector:

http://paperpcb.dernulleffekt.de/doku.php?id=vga_synthesizer:vga_connector

VGA outputboard for the Raspberry Pi:

http://paperpcb.dernulleffekt.de/doku.php?id=raspberry_boards:raspberry_vga_board

VGA and Sound Blender:

http://paperpcb.dernulleffekt.de/doku.php?id=vga_synthesizer:vga_sound_blender

Color Signal —— 75R —— GND

http://www.geeks3d.com/20091230/vga-hack-how-to-make-a-vga-dummy-plug/

http://crackedraytube.com/pdfs/hacking_a_vga_monitor.pdf

VGA Signal Generator
HSYNC and VSYNC signals are squared pulses of +5V, and the RGB signals take values in a continuous analog voltage range from +0V (absolutely dark) to +0.7V (maximum brightness).

H-Sync – 68 Ohm – Pin 03
V-Sync – 68 Ohm – Pin 10
R – 470 Ohm – Pin 04
G – 470 Ohm – Pin 05
B – 470 Ohm – Pin 06

http://dernulleffekt.de/doku.php?id=i2c_over_vga

VGA Video Signal Format
Arduino Uno output to VGA monitor
VGAX Library for Arduino UNO
VGA Signal Timing
Homemade VGA Adapter