[Samsung Galaxy Gio GT-S5660] ItachiSama:
Must read threads before doing anything:

http://xdaforums.com/showthread.php?t=1397120

http://xdaforums.com/showthread.php?t=1535320 (more info about roms)

Source:

This thread is based on the compilation thread found HERE.

[ROMs]

GINGERBREAD ROMs

- [ROM] XPeria Boss (Continued Xperia Gio) Final

- [ROM] [PORT] SGS2 ICS Clone For Gio!

- [ROM]Crane Rom

- [DEV][ROM][GT-S5660]FingerPrint

- [BACKTOWORK][PORT][ROM][2.3.6 XWKT7] ➣ Adrenaline™ ROM

- [ROM]XperiaTized V10

- [MOD] NostalgiaMod [Beta2.2]

- [ROM][2.3.6]Light Orange

- [ROM] Enhanced236 - stock 2.3.6

- [PORT][ROM]Beats With Smooth Sense V5

- [PORT][ROM]iOS for GIO

- [ROM]SpaceLess V5

- [DEV][PORT][ROM] Dynamite rom

- [ROM] giospeedo

- [ROM][CWM] Stock Gio 2.3.6 ext4 fs

- S5660 - GIOPRO v1.6 (Android 2.3.6)

- [DEV][ROM] GioSII ROM (Android 2.3.6) Galaxy SII Themed! V4[Semi-Final]!

- [ROM & Kernel][2.3.6] ➣ Adrenaline ROM 2nd ™ | Galaxy Gio Edition|

- [DEV][PORT] SGSIIv7

- [DEV] DianXin OS Gio (DX ROM)

- [DEV][ROM & Kernel] BNC-GIO-v1.0-R2 (Android 2.3.6)[update]

- [DEV][ROM & Kernel] Chocobread GIO!! :)

- [DEV][Rom & Kernel][IMAGINARY ICS GIO][Multi Language]

- [DEV][ROM][GIO] OmegaICS [Stock 2.3.4]

- [DEV][WIP][ROM] giopower V1

- [GT-S5660][ROM] Jonas Hendrickx's ROM v3.1 [2.3.5][XXKS2]

- [ROM][Samsung Galaxy Gio GT-S5660][2.3.5] Particle (beta)

- [dev][port] wp7

- Samsung Galaxy Gio GT-S5660M - ArpegGioMod ROM

- [Rom][DEV] Damn Small Gio

CM9 (ICS) ROMs

- [DEV] CyanogenMod 9.0.0-RC0-GalaxyICS-UNOFFICIAL-nightly

- [ROM][DEV][WIP][ICS] NexusGio Feel the Stock ICS on your Gio [Download ready]

- [DEV][ROM] AOKP Project [4.0.4]

- [ROM][Galaxy SIII] GioSIII V6

- [DEV][PORT][ICS] AOKP Build 34

CM7 ROMs

- [ROM][PORT] Blackberry OS 6.1

- [DEV]CyanogenMod-7.2.0-RC3-gio-KANG

- [DEV]Cyanogenmod 7.2 RC3 by antonio8297

- [PAUSED][ROM][CM7] °•`CleanGinger`•° Pure Google UI

- [PORT][ROM]TouchWiZZed4 U

- [ROM & KERNEL][CM7.2-BASED] CyanMobile eXperience (2.3.8) Release

- [PORT] [ROM] Koogly Mokee FINAL for Gio

- [ROM] CM7.2-DEMOCRACY

- [ROM]CyanogenMOD 7.2 SUPREME

- [ROM]CM7.2 RC3-Apocalypse for GIO FINAL Version-

- [WIP][ROM] DebianDroid - MoltenMotherBoard

- [ROM][PORT][CM7.2] dRoiDGIo

- [PORT] [ROM] CM 7.2-RC3-AA For Gio!

- [Rom][Port] CyanogenMod 7.2.0 RC1 Miracle Edition

- [DEV] CyanogenMod-7.2.0-RC1-gio-UNOFFICIAL

- [ROM][PORT]JoyOS 1.2.1 [UI IMPROVED]

- [ROM][PORT]LewaOS GIO

- [PORT][ROM] SE Live With Walkman UI [CM7.2]

- [No Touchwiz UI][MOD] Mod No touchwiz Ui [Based on CM 7.2]

- [DEV][UNOFFICIAL]CyanogenMod 7.2-GIO

- [ROM + kernel][dev][port] JoyOS 1.1.8

- [MOD][CM7][WIP] LgGio Beta v0.2 Not final yet!

- [ROM][PORT]JOYOS-1.1.0[Feel iOS on Android]

- [PORT][ROM][CM 7.2][HTC Interfeys!]BeautySense[UnrealSmooth]

- [rom]FINAL VERSION PORT BUGS FREE

- [ROM] NightlyFourE 5.1 GIO | Patch #1 | *Stable* *Smooth*

- [DEV][PORT][GIO] MIUI Gingerbread Beta 4b [CM7.2]

- [Kernel & ROM][TeamCooper]RazrUIv4 GIO,The battery Monster

- [GIO] LiGux OS 3.2 RC 2 | *Stable* *Smooth*

- [DEV][PORT] LunaMalaya

- [Mod][CM7.2] HuwaeiGio

- [mod][ICS] ICSGio!

- [DEV][ROM & KERNEL][CM7.2-BASED] CyanMobile initial A (2.3.7) Release

- [MOD][CM7.2] XperiaGio V1.0 Final

- [ROM][2.3.7]CyanogenMod 7.1 KANG

- [mod][CM7][WIP] SenseGio

- [mod][cm7] SlideGioScreen!

- [mod][cm7] WP7Gio

- [mod] [CM7.1] HoneyGio

- [ROM][PORT]Ju AngeeksTM-v1.1[Full Transparant]

- [ROM] Cy4noobsMod-7.1.3.1

- [mod][cm7] Iphone mod cm7

- [MOD][CM7] custom Ice Cream Sandwich Mod CM7.2

- [ROM] TheSeriousMod

- [DEV][2.3.7]CyanogenMod 7.2-GIO-KANG-RC0 build 4

- [DEV] [Samsung Galaxy Gio] [Android 2.3.5][Cyanogenmod 7.1] Cyano Gio project

MIUI ROMs

- [DEV][PORT][GIO] MIUI Gingerbread Beta 4b [CM7.2]

- [DEV][ROM] MIUI4 based on CM9 beta5 from GalaxyICS

- [ROM][MIUI]C-miui-kamyar

- [DEV][ROM] MIUI4 2.2.24-GIO Alpha3-base 4.0.3 (DEVS only)

- [ROM](Teamcooper)MIUI V4 (2.2.17)

- [DEV][ROM] First | MIUI4 2.2.24 | for GIO Beta3 - base 4.0.3 (CM9)

Sense roms

- [DEV][PORT][ROM]HTC Sense 3.5

- [dev][rom[team sense][htc sense 2.1

- [DEV][ROM][WIP]Real HTC Sense 2.1 for GIO

Stock ROMs

- [ROM] S5660XXKTK [21.03.2012][Android 2.3.6] RFS Filesystem!

- [ROM] S5660DXKT8 [08.03.2012][Android 2.3.6] RFS Filesystem!

- [ROM] S5660XXKTI [04.03.2012][Android 2.3.6] RFS Filesystem!

- [ROM] S5660JPKT7 [07.03.2012][Android 2.3.6] RFS Filesystem!

- [ROM] S5660MUGKG3 [25.07.2011][Android 2.3.4] RFS Filesystem!

[RECOVERYs]

- [RECOVERY] GT-S5660M Stock & ClockWorkMod Recovery 5.x

- [RECOVERY]Stock & ClockworkMod 5.0.2.8 Recovery

- [DEV][WIP][Recovery]PX Custom Recovery 0.3.6[BETA][Last Update: Mar 16, 2012]

- [DEV][PORT] RZRecovery 2.1.4 Galaxy GIO GT-S5660

- [AIO][Recovery]All in One Recovery pack[AROMA Installer]

[KERNELs]

- [Kernel]PX-Kernel For Stock & CyanogenMod7 ROM

- [dev][kernel] custom kernel cm7.2

- [Kernel][UPDATE] Delano Custom Kernel of CM or BNC-R2 ROM Samsung Galaxy Gio GT-S5660

- [CF-Root 3.7][Universal] CF-Root Adaptation for Galaxy GIO {Working For GB & CM Roms}

- [Kernel][UPDATE] Delano Custom Kernel Galaxy Gio (not cyanogen) [dell]

- [kernel]Phiexz's custom Kernel, only STOCK ROM

[Bootanimations]

- ICS Boot animation

- [WIP]Bootanimation Pure Android

- Boot animation booting PC

- [Bootanimation] Nexus one

- [Bootanimation] Fake factory reset

- [Bootanimation] LightFlow

- [REQ]Beats Bootanimation (4th post)

[SCRIPTs]

- [CWM][SCRIPTS][TWEAKS] Adrenaline™ Engine | 4.0 | 3/6|

- [SCRIPTS][TWEAKS][CWM]SlaidyBoost-V2.3

- [SCRIPT][Tweaks]LagFreeV1[One Script To Roll Them ALL]

- [MOD][SCRIPTS][Tweaks][Happy new year]SlaidFastMODV2.5

[MODs]

- [MOD] Increase internal memory of your Gio

- [MOD] Improve your battery life tenfold

- Ultimate_Multimedia_Enhacement pack for FIT,MINI,GIO...

[TUTORIALs]

- How to unbrick Samsung Galaxy Gio

- Flash Firmware DXKT4 (2.3.6) Galaxy Gio GT-S5660 with autodeodexing+overclocking

- [Rooting] Galaxy Gio GT-S5660

- Building Android [kernel] from source

- [GUIDE] Unpacking / Packing / Repacking Boot.img's and Recovery.img's

- [Tutorial]Deodexing + Zipaligning Galaxy Gio GT-S5660

- [TUTORIAL] Solution for faster GPS locks

- Universal Gingerbread Root & Unroot 2.3.3 -> 2.3.7+​

If something is missing or information is incorrect please pm me.