Google's Nexus smartphones are the only ones that ship with stock, vanilla Android build. Other Android-powered handsets usually ship with either slightly altered variants of Android, or completely skinned builds, depending on which company are we talking about. Motorola and OnePlus, for example, tend to tweak stock Android to a certain degree, but nothing too fancy. Samsung, HTC, LG, Sony, Xiaomi... and many other smartphone manufacturers implement their very own skins on top of Android.
That being said, many users didn't like the fact companies skin Android, and some of those skins were actually affecting the performance of particular smartphones, and still do. Well, that's where ROMs come in, Android is an open source OS, and tons of developers released various ROMs for Android devices in order to let you change their software. Cyanogen's CyanogenMod is arguably the most popular ROM out there. This ROM is available to tons of device, and the CyanogenMod 13 nightly (experimental) builds based on Android Marshmallow started rolling out back in November last year. Cyanogen was releasing only nightly builds of CM13 thus far, but the company has now announced that first non-nightly CM13 build are now available for a number of devices, read on if you're interested.
The company says that you can now download Snapshot build for the following devices: Nexus 6P, Nexus 5X, Nexus 6, Nexus 5, Nexus 4, OnePlus One, Moto E (2015), Oppo Find 7, Oppo Find 7s, Oppo R7 Plus, Xiaomi Mi 4, LG G2, Android One devices, Nexus 7 (2013) Wi-Fi and 4G variants, Nexus 9, Nexus 10... and a number more devices. CyanogenMod 13 Snapshot release actually brings a ton of improvements over the latest nightly build, the list is quite lengthy. The company has included a number of new functionality features throughout the OS, but they've also fixed a number of bugs and improved the reliability of the ROM altogether, as it's usually the case with such builds, especially when making a transition from nightly to a snapshot release. If you're interested in checking out the full changelog, follow the source link down below. If you'd like to download one of the CM13 Snapshot releases, click here.