OxygenOS 3.5 Community Build for the OnePlus 3 - OnePlus Forums
https://forums.oneplus.net/threads/oxygenos-3-5-community-build-for-the-oneplus-3.461235/

Default^

Light ^

Dark^

N style quick toggles too

3 new gestures

New Things :

You can now edit individual icons on the OxygenOS Launcher, set custom icons for separate applications.
No Circle or Text options available for battery icon. Just portrait icon with percent next to it.
New Messages, File Manager, Calculator, Dialler and Recorder apps.
3 themes available : Dark, Light and Default. (don't try dark it's awful)N-ified Notification panel and quick settings. With Quick Toggles from Android N.
You can have a local upgrade for updates. (Download OTA files to your storage from external source and flash it)
Few new animations.
Few Alert Slider customisations.
3 new gestures. Flip to mute, 3 finger screenshot and pocket mode.
Color balance screen from H2OS.
You can now set default apps for Camera, Gallery, Music and Mail apart from Desktop, Dialler, Messages and Browser.
Scheduled Power On/Off (Only if startup password is disabled)
New "join user enjoy plan" in Advanced Settings.
Not sure what it does.
You can now change your phone name in About Phone

Thanks to @iamavneetsingh from the forum

http://m.imgur.com/a/fPW3Q

More screenshot

Arter CM13 and kernel for Oneplus 3 has been updated

Build date - 25th August
Changelog:
CM source merge
AOSPA's improvements by The crazylex and xboxfanj
- Massive Kryo-specific optimizations
- ART & jemalloc(memory allocator) optimizations
- RIL is now in power saving mode
WiFi re-association RSSI thresholds relaxed (by sultan)

Link- http://forum.xda-developers.com/oneplus-3/development/arter97-s-custom-built-cyanogenmod-13-t3439217/page28
Kernel changelog

Version - 1.2
Automatic TRIM(discard) now enabled
Many sultan's improvements merged
Switched to FSF GCC 6.2

Link - http://forum.xda-developers.com/oneplus-3/development/arter97-s-custom-built-cyanogenmod-13-t3439217/page28