We often talk about CyanogenMod Nightlies here on Android Police, but unless you like living on the bleeding edge of custom ROMs or you're just running them on a secondary device, you'll likely think twice before flashing them on your phone. CyanogenMod Snapshots, on the other hand, are released intermittently and are more reliable versions of the ROM, sitting somewhere between "nightlies" and "stable" builds.
The first CyanogenMod 13.0 snapshot builds started rolling out about a month ago, and now a second snapshot is being pushed for plenty of devices. This one should be more stable and, depending on your device, might have a couple more features than the first snapshot.
These builds are based on Android 6.0 Marshmallow and don't come with Google Apps pre-installed. You'll need to grab the corresponding GApps zip package and flash it manually to get Google Play Services, the Play Store, and all other Googly things on your device.
- CyanogenMod Snapshots