Based on Android 4.4.4 KitKat, LiquidSmooth ROM brings you the best and great Android along with root, customization, and many countless features.
I have been following LiquidSmooth ROM for awhile now (few years) and it used to be one of my favorite custom ROMs.  Well, they stopped developing for a period of time but they are back better than ever, with killer features like custom kernel built-in the ROM so you can easily overclock to 1.836Ghz to play your graphic-intensive games.
Not only that, LiquidSmooth ROM gets plenty good battery life (when not overclocked) while performance is blazing-fast.  Once you install this, you will never go back to Android 4.4.2 or older ever again.
I know Samsung has finally released 4.4.2 on some of the S3 variants but I find them very laggy and plus Android 4.4.2 is so old already as Google has already released beta versions of Android 5.0.
With LiquidSmooth ROM, you will find everything running like liquid and “smooth”, just as its name implies.  You will get a nice stable ROM with everything working out of the box including your camera/camcorder, data/network (working great for Sprint/Verizon unlike some of the older AOSP ROMs in the past), and much more.
As for features, LiquidSmooth ROM is loaded with endless number of features like Hover, Pie, Active Display, HALO, PIE, Shake Events, and more.
If you are itching to try out new ROMs this week(end), give LiquidSmooth ROM a go and tell me how much you
likelove it!

Download:

Download LiquidSmooth ROM for Galaxy S3 (AT&T, T-Mobile, Sprint, Verizon, Cricket, MetroPCS, US Cellular, Canadian)
Download LiquidSmooth ROM for Galaxy S3 GT-i9300 (NEW – v.3.2 Front camera fixed!)
Download LiquidSmooth ROM for Galaxy S3 GT-i9305  (NEW – v.3.2 Front camera fixed!)
Download Android 4.4.4 Gapps (DO NOT USE OLDER GAPPS!!!)
NOTE: You need to update you CWM Recovery to v6.0.4.3 or higher OR also update your TWRP Recovery to v2.6.3.3 or higher.  You can update your recovery by downloading CWM/TWRP then using Flashify app CLICK HERE.
To install, reboot into recovery, make backup ROM, wipe data/factory reset, install ROM, install Gapps, and reboot. (If for some reason you end up in a bootloop, reboot into recovery, go to Advanced Wipe for TWRP or Mounts & Storage for CWM, format/wipe /system, then re-install ROM.)
First time installing a custom ROM?  See How to Install Custom ROM on Galaxy S3!
Credits - XDA <— Please donate to the developer of this ROM or hit Thanks button on XDA if you like it, thx!
Extras:
Want latest Android L Preview Keyboard?  See How to Install Android L Preview Keyboard on rooted Android!
If you want some awesome audio, check out Viper4Audio FX MOD, which you can install on this ROM to enhance your music 100%.
If you want to run your apps in tablet/hybrid/custom DPI mode, see our Xposed App Settings guide.
If you want PIE Controls, see our LMT Pie Control guide.