This is the twlauncher 4.5, actually the tw4 launcher from Samsung heavily modified by Fr4gg0r and Swiftwork. Download TW Launcher apk for Android for free from the link given below.
Screenshot:

Installation of Applications & Widgets
First of all, your phone DO NOT have to be ROOTED! You will be able to install it without having rooted your phone, but you will miss some options.
Secondly, I strongly suggest you to have another launcher installed (and defrozed)… this for avoiding a loop reboot and to be able to work, remove,… with applications.
Here are two choices :
1. simple put the .apk of the launcher in any folder of the phone and double-clic on it
2. follow this upper procedure :
if you do not have the TW4.5 installed (and have a Samsung phone or have touchwizz installed) :
go in “system/app”
find “TouchWiz30Launcher.apk” and rename it to “TouchWiz30Launcher.apk.OLD”
find “TouchWiz30Launcher.odex” and rename it to “TouchWiz30Launcher.odex.OLD”
find “TWLauncher.apk” and rename it to “TWLauncher.apk.OLD”
find “TWLauncher.odex” and rename it to “TWLauncher.odex.OLD”
find any other file with “TW” and “Launcher” in the name and rename them with .OLD at the end
if you do not find this files (other phone or touchwizz not installed), don’t be afraid… just skip this steps ![*]if you already have a version of TW4.5 installed :
go in “system/app”
find “TW4Launcher.apk” and rename it “TW4Launcher.apk.OLD” or simply delete it
copy the latest version of launcher you have downloaded in this folder.[*]if you want to make a really clean new installation of your launcher, you also can rename “data/data/samsung.tw4.nextgen” folder in (for example) “samsung.tw4.nextgen.OLD”, do the same for “sdcard/.TW4Themes” folder to “sdcard/.TW4Themes_OLD” (or delete it) and relaunch the launcher.
The new folder, with default settings, will be created.
Last points… installing the Widgets.
First to know that special widgets needs to :
- have a samsung framework
- have been resigned to be functionnals with TW4.5 Launcher
You also can download some widgets (resigned) for SG1 and SG2 via TW4Manager and “Widgets” :
run TW4Manager (think just to check you have the very latest version)
go in “Widgets”
select the system you want (SG1 or SG2)
a list of available resigned widgets will be shown
check the one you want
hit the “Menu” button
choose “apply selected”
The widgets will be installed.
Download TW Launcher apk for Android here.
Got problems in downloading TW Launcher apk??? Please report it in comments.