As there is no repository for latest available mods of retro game consoles here a list.

I only focused on 2nd and 3rd generation consoles. If someone is able to create a 4th or greater generation (NES, Sega etc.) mod list it would be great. Also added a comment about latest and greatest release of a mod as it replaces older versions.

Entries with "#" in front are upcoming mods

Atari 2600
- AV Mod, latest keeps HF modulator
- S-Video Mod (obsolete due to S-Video abandon)
- VGA Mod (obsolete due to VGA abandon)
- Stereo Mod. Latest one Stereo/Surround with 3D Audio for PAL/NTSC
- Pause Mod. Latest one via Joystick, switching off Audio and Video, push button in the back
- Power LED Mod. Latest one within Switch/Background
# RGB Mod
# Bluetooth Joystick Mod
# Real-Surround Mod

Atari 5200
- Power Supply Mod
- AV Mod
- S-Video Mod (obsolete due to S-Video abandon)
# RGB Mod
# Stereo/Surround Mod

Atari 7800
- Power Supply Mod
- AV Mod. Latest one using MCU to control gfx-subsystem and keep HF Modulator
- S-Video Mod (obsolete due to S-Video abandon)
- Stereo Mod, latest one with Stereo/Surround and 3D Audio for PAL/NTSC
# Pause Mod, For 2600 and 7800 via Joystick, switching off Audio and Video
# RGB Mod
# Bluetooth Joystick Mod

Coleco Vision
- AV Mod
- VGA Mod (obsolete due to VGA abandon)
- Pause Mod, latest one using RESET Switch and/or Numeric Pad, switching off Audio and Video
- Power Supply Mod (obsolete due to repro-power Adapter)
# RGB Mod
# Bluetooth Joystick Mod
# Steering Wheel USB Mod
# Standalone Atari Expansion Mod

Intellivision
- AV Mod, latest with much better output by keeping HF modulator working with modern TV sets
- RGB Mod
- Stereo Surround Mod, latest with 3D Audio
- Atari Joystick Port Mod
- Power LED Mod, latest with backlight in tray
# Bluetooth Joystick Mod

Fairchild
- AV Mod

Arcadia (Emerson, Videopac etc)
- AV Mod
- RGB Mod