General (English):

• SMS Tributes
• The Sega Notebook
• Holmes's SC-3000/SF-7000 site
• Game Developer Research Institute
• Sega Collect
• SC-3000 Survivors
• SegaMasterSystem.com
• Chris' Sega Hacking Page
• SMS Cheat Codes Database
• The Ela Fountain
• SMS Cart Pad
• Alexkidd.com
• The Power Base
• The SMS Experience
• SMS Information Station
• The Console Legend
• Meetholas' SMS Domain

General (Japanese):

• Sega Virtual Console
• Sega Hard Daihyakka
• Sega Mark III Webpage
• Project Megadrive / BTO8
• Enri's Homepage
• Rig_veda's blog
• Sion Papa no Himitsukichi
• Pocket Gamer
• Sega Power
• Suka Sega
• Slam Tilt -2-
• SG-1000 no Souko
• The Memoirs of Sega Game
• SG-1000.net
• MY SG-1000II
• SG-People
• Sega Old Machine Museum
• Yujiro's Sega Homepage
• TV Gear wo tsukute mita
• FantasyZone Tribute
• K_two's Homepage (Fantasy Zone)

General (Portuguese)

• Sega-Brasil

General (German)

• Gordman's Game Treasure

Games shrine:

• Alex Kidd Shellcore
• Fantasy Zone
• Golvellius
• Wonderboy Land

Shopping/Flash Carts:

• KRIKzz' Master Everdrive
• KRIKzz' GG Everdrive
• NEO MK III Myth, NEO Myth MD 3in1
• Tototek's SMS-Pro
• Tototek's GG-Pro

Emulators:

• MEKA
• Kega Fusion
• MESS
• Emulicious
• RetroCopy
• SMS Plus
• BizHawk
• Emukon
• MesaDX
• FreezeSMS
• Massage
• Master Gear

Emulators for consoles/phones/etc:

• S8DS (DS)
• SMSAdvance (GBA)
• MekaX, SMSPlusX (XBOX)
• SMS Plus GX (Wii, GameCube)
• DrSMS (GBA)
• ApprenticeMinusDS (DS)
• Gcat's Master System Emulator (Raspberry Pi, Android)

Dumps Releases mirrors:

• Mirror 1 (FR)
• Mirror 2 (AU)
• Mirror 3 (IT)