Requirements: Android OS 2.2, Root, Samsung Device
Price: $1.99
Overview: NEED ROOT!
Overclock can be harm to your hardware.
Use at your own risk.
PLEASE!
Check available models and use free version first before you buy.
You must update over v0.2.0.0 for correct core voltage control.
*GT-I9000 leaked 2.3.4 and Gingerbread 2.3.3 is available!
*GalaxyS2 in Europe is available! (confirmed by blaaez at xda)
*GalaxyS2 in Korea is available!
*Galaxy S Gingerbread 2.3.3(only in Korea) is available!
What is this?
This is for family of Galaxy S and Galaxy S II devices.
You can set maximum CPU frequency of your device on available models EASILY.
This works with STOCK kernel, STOCK rom, (x)custom kernels and roms(x).
OOPS, after Gingerbread, not available on custom kernel that modified kernel source codes(added function symbols..etc). Froyo is still possible on almost customs.

Features on Ultimate:
*Set scaling governor and min/max frequency.
*2x1 home screen widget
*Set customized frequency (1.0 ~ 2.0 GHz)
*Set customized voltage (750 ~ 1400 mV, OV or UV available)
*Available set last settings on boot automatically.
- Stability checking background service is turned on about 5 minutes every time when you change settings.
- If your device freeze or shutdown while it is running, app will show you popup to apply the last setting on boot.
*Show ARM core voltage at max frequency.
*Show your device information
*Free from Advertisement
*Tweaks (Io Scheduler)
*Set scaling governor and min/max frequency.
*Set cpu max frequency
-- GalaxyS: 1.0 ~ 1.3GHz
-- GalaxyS2: 1.2 ~ 1.452GHz
*Show ARM core voltage at max frequency.
*Show your device information
*Tweaks (Io Scheduler)

How to use?

First, click "Load overclock module.
Second, click "CPU max frequency" and choose one frequency from preset options.
You can control more detailed option in "Optimization" menu.
About voltage control
GalaxyS2 Gingerbread: +-25 step
GalaxyS Froyo: +-25 step
GalaxyS Gingerbread: +-1 step

SUPPORTED DEVICES LIST:
Available GalaxyS2 Family
*GalaxyS2 (GT-I9100, Gingerbread 2.3.3)
*GalaxyS2 (SHW-M250S, Gingerbread 2.3.3)
*GalaxyS2 (SHW-M250K, Gingerbread 2.3.3)
*GalaxyS2 (SHW-M250L, Gingerbread 2.3.3)

Available GalaxyS Family
*Captivate (SGH-I897, Froyo 2.2 / 2.2.1)
*Captivate, Rogers (SGH-I896, Froyo 2.2 / 2.2.1)

*Epic 4G (SPH-D700, Froyo 2.2 / 2.2.1)
*Fascinate (SCH-I500, Froyo 2.2 / 2.2.1)
*Fascinate, Telus (SGH-T959D, Froyo 2.2 / 2.2.1)
*Galaxy S (GT-I9000, Gingerbread 2.3.3, Froyo 2.2 / 2.2.1)
*Galaxy S (GT-I9000M, Froyo 2.2 / 2.2.1)
*Galaxy S (GT-I9000B, Froyo 2.2 /2.2.1)
*Galaxy S (SHW-M110S, Gingerbread 2.3.3, Froyo 2.2 / 2.2.1)
*Galaxy K (SHW-M130K, Gingerbread 2.3.3, Froyo 2.2 / 2.2.1)
*Galaxy U (SHW-M130L, Gingerbread 2.3.3, Froyo 2.2 / 2.2.1)
*Galaxy Player (YP-GB1, Froyo 2.2.1)
*Galaxy Player (YP-GB70, Froyo 2.2.1)
*Galaxy S Hoppin (SHW-M190S, Froyo 2.2.1)
*Giorgio Armani Galaxy S (GT-I9010, Froyo 2.2 / 2.2.1)
*Mesmerize (SCH-I500, Froyo 2.2 / 2.2.1)
*Vibrant (SGH-T959, Froyo 2.2 / 2.2.1 )
*Vibrant Plus (SGH-T959V, Froyo 2.2 / 2.2.1)

What's New:
[ v0.6.0.4 ]
minor bug fix
[ v0.6.0.2 ]
Galaxy S and Galaxy Tab - supports chaging frequencies over 1.0GHz
Galaxy S II - supports changing frequencies over 1.004GHz