HTC One A9 users will soon be able to get the latest CyanogenMod build for their phones. The CM13 nightly build has just been released by Cyanogen earlier this week. The build is particularly based on Android 6.0 Lollipop but only for the GSM model of the HTC One A9. It's not surprising that an early release is available for the smartphone because it already comes with Marshmallow pre-installed.
While others are still waiting for Android 6.0 Marshmallow to hit their smartphones, here comes HTC One A9 getting some CM love already. If you prefer a more basic or stock Android Marshmallow, switch to this nightly build. Flash it on your phone and you'll soon see the difference of CyanogenMod from the standard OS layered with Sense UI.
Aside from the controversial, premium HTC One A9, the old Motorola Moto E (1st-gen) is also eligible for the CM 13 nightly build. As with most nightlies, the two CM builds aren't very stable yet so download and flash AT YOUR OWN RISK. Also note that warranties of both handsets may be void once you install the custom ROM.