I have created one list of roms hacks to download, it have 161 hacks in list. The name of roms hack is listed below:

1. Sonic Games to play online on your web browser for free. KBH Games Favorites Home New Games Top Games Best Of New Action 2 Player Puzzle Shooting Sports Arcade Fighting Racing RPG Retro Multiplayer Funny Run Skill Educational Simulation Platformer Strategy Casual Word Card Board Car Bike Soccer Animal Cartoon Sonic Mario Minecraft Star Wars.
2. Sonic 3 Metal Edition is basically what it sounds like, all of the characters (including Robotnik) have been replaced by their robotic dopplegangers. For this hack you get to play as Metal Sonic V4, Tails Doll V2, and Metal Knuckles V2. Metal Sonic can turn into a new version of Metal Sonic Kai when you collect all of the super emeralds.
3. Sonic 3 Complete is a ROM hack of the game Sonic 3 & Knuckles that aims to improve every aspect of the game without changing the gameplay, the challenges, or the game mechanics.

CoolROM.com's game information and ROM download page for Sonic the Hedgehog 3 (Sega Genesis). Play with Sonic, Shadow, Mighty, Tails, and Knuckles in this high speed hack of Sonic 1. All the music has been changed, as well as the palettes. There is a new layout, and a bunch of ASM changes. Version 4.0b shows the game ported to the Sega CD, and introduces several new features. The ISO linked here is for US Sega CDs.

Amy in Sonic 1 v1.0
Anti-Sonic the Hedgehog 2
Ashura in Sonic 1
Ashura the Hedgehog
ATOMICSONIC
ChimpoQ!
Eggman in Sonic 1
Knuckles in Sonic 1
Knuckles in Sonic 2 (BIOHAZARD)
Mighty the Armadillo Beta 0.3
Mighty the Armadillo Beta 1.0
Mighty the Armadillo Beta 1.5
Mighty the Armadillo Beta 3.0
Mighty the Armadillo v.4.16
New Sonic 2 1.5 (U) (REV01)
New Sonic 3
NSA 2 beta 1 demo
Project Shadow 2 Demo 4 (v1.00)
Project Shadow Demo 4 Bonus
Ray in Sonic 1 v4.0
Red Hot Sonic 2
Robotnik's Revenge v1
Sonic 1 & Knuckles - Tails In Special Stages
Sonic 1 Alpha Hoax
Sonic 1 Amy
Sonic 1 Athens
Sonic 1 Beta Hoax
Sonic 1 Beta Remake v004
Sonic 1 Bouncy Edition
Sonic 1 chao walker
Sonic 1 Code Gray V1.0
Sonic 1 dr iks
Sonic 1 Easy
Sonic 1 Extended Edition (First Release)
Sonic 1 Fantasy Worlds Release 0.99 Super Sonic Build
Sonic 1 Fantasy Worlds Release 0.99
Sonic 1 Fantasy
Sonic 1 Gaiden v04
Sonic 1 Harder Levels (6th Project's aniversary)
Sonic 1 Harder Levels v005 Beta 2
Sonic 1 Harder Levels v005 DEMO 01
Sonic 1 Hyperx V1
Sonic 1 Mega Hack Public Release 1
Sonic 1 Mega Hack Ultra Rare Version
Sonic 1 Megamix v1.0
Sonic 1 Megamix v2.0
Sonic 1 Megamix v3.0
Sonic 1 Megamix v4.0 (U).iso
Sonic 1 Metal Sonic
Sonic 1 Metallix
Sonic 1 Mobius Adventures 2.5
Sonic 1 Mobius Adventures 2.7.5
Sonic 1 Neo Adventures v0.1
Sonic 1 Neo Adventures v0.2
Sonic 1 New Version EggMan Attack!
Sonic 1 Nineko Edition
Sonic 1 Oergomized v4.2
Sonic 1 OMG THE RED RINGS
Sonic 1 Open Source Project 0.05
Sonic 1 Pixel Perfect Beta 1
Sonic 1 Planets in Marble Zone
Sonic 1 Plus v0.1
Sonic 1 Plus v0.2
Sonic 1 project unknown
Sonic 1 Psycho
Sonic 1 Real-Time Demo Recording
Sonic 1 Remastered v.1.1
Sonic 1 Remastered
Sonic 1 Remix WIP - Green Hill
Sonic 1 Remix
Sonic 1 Return to the Origin v2
Sonic 1 Richrodgers
Sonic 1 SA1
Sonic 1 Seizure
Sonic 1 South Island Adventure v0.3
Sonic 1 Spindash
Sonic 1 Splats The Rabbit
Sonic 1 SSRG Tech Demo
Sonic 1 SSRG [Built on 18th January 2009 22.02] [Demo] (Dedicated)
Sonic 1 Supersonic in South Island Adventure v0.2
Sonic 1 The 7th Emerald
Sonic 1 The Blue Blur
Sonic 1 The Final Showdown (v2.1)
Sonic 1 Tikal
Sonic 1 TSH Beta 2
Sonic 1 TSH Beta 3
Sonic 1 Ultima 1337
Sonic 1 weird
Sonic 1 Westside Island
Sonic 1 with Sonic 2 Menu
Sonic 1 xmas
Sonic 1 ZX - January 24, 2009 Demo
Sonic 1 ZX
Sonic 2 & Knuckles Long Version v1.8
Sonic 2 (SA2 style - Light Side v1.6.7)
Sonic 2 Advanced Edit Release 3 beta
Sonic 2 Advanced Edit
Sonic 2 Aluminum Edition
Sonic 2 Armageddon Game
Sonic 2 Delta 0.23
Sonic 2 Delta 2
Sonic 2 Delta II 10A
Sonic 2 Delta III v0.2
Sonic 2 Delta IV v0.01
Sonic 2 Delta
Sonic 2 EX v.4.2
Sonic 2 GHZ v0.2
Sonic 2 Haven Light and Sunset
Sonic 2 haz
Sonic 2 hell
Sonic 2 Homing attack
Sonic 2 Ice Knights
Sonic 2 Innovative
Sonic 2 Long Version v1.8.1
Sonic 2 Lost Paradise Version 2
Sonic 2 Mecha World
Sonic 2 Megamix
Sonic 2 Millenium Edition v.0.85
Sonic 2 More Than A Memory - The Perfect Existance
Sonic 2 Omega
Sonic 2 Rabid
Sonic 2 Recreation Demo
Sonic 2 Remix
Sonic 2 Retro Remix (new version)
Sonic 2 Retro Remix
Sonic 2 S3 Edition v1.11
Sonic 2 Salus
Sonic 2 SMTP
Sonic 2 Team Black Force
Sonic 2 The Hybridization Project
Sonic 2 Tohaka v0.21
Sonic 2 ultimate
Sonic 2 Underwater
Sonic 2 xp
Sonic 2 Zeta Overdrive EHZ Beta
Sonic 2 Zeta Overdrive SAGE Beta
Sonic 2 Zeta Overdrive
Sonic 2010 Demo 2 (aka Independence Demo)
Sonic 2K (1 Mb)
Sonic 2z v.0.50
Sonic 3 & Knuckles Master Edition
Sonic 3 Delta v0.1a
Sonic 3D (no flickie)
Sonic and the Secret Extended Edition
Sonic Boom
Sonic for MegaCD (U).iso
Sonic in paynt 2
Sonic in paynt
Sonic Rings 2 PRO
Sonic Rings 2
Sonic Rings 3 V0.1

Sonic 3 Exe Rom Hack Download Windows 7

Sonic Rings PRO
Sonic Rings
Sonic The Lost Land 2
Sonic The Lost Land
Sonic The Sequel - Unmastered (v2)
Sonic Uno v0.3a
Sonic X
Tails in Sonic 1 v2.1.1
The S Factor - Sonia and Silver

Sonic 3 Rom Hacks Download

Zonic final version

Sonic 2 Rom Hack Download

Download link:
http://www.mediafire.com/?sharekey=4bc86a57ae98d4467432d3c9683f450a7b95b989a74d3d0a87095ac91101628c