If you don't know what CyanogenMod is, CyanogenMod is actually not just a mod, but it's a ROM, but basically it's a stock android look, in this case it's 4.2 Jelly Bean, but it has a lot more customizable things, like the lock screen, the notification bar, lots of downloadable themes, and much more.

CyanogenMOD 10.1 has reached its first "M-Series" milestone builds for various devices.  These builds are intended to be mostly stable and ready for everyday use, based on Jelly Bean MR1. More devices are being worked on, and are available as nightly builds for the time being.

These devices are been supported

* Samsung Captivate
* Samsung Nexus S (+4G)
* Samsung Galaxy S3 USA models (D2*)
* Samsung Galaxy S (galaxysmtd/galaxysbmtd)
* Google Nexus 7
* Google Galaxy Nexus (all variants)
* Google Nexus 4
* Google Nexus 10
* ODroid U2
* Samsung P3100, P3110
* Samsung P5100, P5110

Get it now at https://www.cyanogenmod.org

Today CyanogenMod users have access to the newest M build of CyanogenMod 10.1. The new 10.1-M2 builds are based on the newest Android 4.2.2 code, bringing all of features of Jelly Bean plus a whole slew of custom features that we've come to expect from CyanogenMod releases.

Around 20 devices are available to flash these devices on, including the Galaxy Nexus, Galaxy S III, Nexus 4 and the Nexus 10. If you're interested in flashing the newest CyanogenMod 10.1-M2 builds on your device, check the list of compatible devices below.

• Acer Iconia a700
• Google Nexus S (crespo, crespo4g)
• Google Nexus 7 (grouper, tilapia)
• Google Galaxy Nexus (toro, toroplus, maguro)
• Google Nexus 4 (mako)
• Google Nexus 10 (manta)
• Google Nexus Q (steelhead)
• Hardkernel Odroid-U2
• HTC One X (evita)
• HTC Incredible 4G LTE (fireball)
• HTC Evo 4G LTE (jewel)
• HTC One S (ville)
• LG Nitro HD (p930)
• LG Optimus LTE (su640)
• LG Spectrum (vs920)
• Samsung Galaxy S (captivatemtd, galaxysbmtd, galaxysmtd, epicmtd)
• Samsung Galaxy SII (i9100g, hercules, skyrocket)
• Samsung Galaxy SIII (US variants d2att, d2cri, d2mtr, d2spr, d2tmo, d2vzw)
• Samsung Note (quincytmo, quincyatt)
• Samsung Galaxy Tab 2 7.0 (p3100, p3110)
• Samsung Galaxy Tab 2 10.1 (p5100, p5110)