Galaxy Ace 3 CM13 brings Marshmallow Update unofficially
HTC One A9 OTA update released in Taiwan with version 1.10.709.9
T-Mobile Note 5 and S6 Edge Plus OTA update (COJ5) rolling out with Gear VR support, Security patches and bug fixes
Download One M8 Marshmallow for T-Mobile, AT&T and International variants [RUU and ZIP file]
[Download] HTC One M8 Gpe Marshmallow OTA MRA58K.H6
Sprint Note Edge OTA update rolling out, build N915PVPU4COJ5
Moto G2 CM13 gets you Marshmallow update unofficially
LG V10 update rolling out, improves touch and ringtone effects
No LG G3 CM13 yet but Marshmallow update available via XenonHD ROM
Download Yureka and Yureka Plus Android 5.1 Cyanogen OS 12.1 (CM12.1) update
No CM13 but an AOSP ROM for Galaxy S3 brings Marshmallow Update unofficially [Android 6.0]
Galaxy Note 3 CM13 brings Marshmallow Update unofficially [Android 6.0]
Galaxy S5 CM13 brings Marshmallow Update unofficially [Android 6.0]
Sony Xperia SP CM13 brings Marshmallow Update unofficially
Nexus 4 CM13 brings Marshmallow Update unofficially
Galaxy Grand 2 CM13 brings Marshmallow update unofficially
Moto G CM13 gets you Marshmallow update unofficially
CM13 for Galaxy S5 Mini brings Marshmallow Update unofficially
