OnePlus has changed the top-level domain of their website from oneplus.net to oneplus.com. The old .net links redirect to the corresponding .com ones, so your existing links should be fine. Just don't be alarmed if you see these new .com links thinking they're scam.

Edit: official announcement can be found Here

OpenBeta Update

Details
• Version: OpenBeta 34 & OpenBeta 25
• Type: #rom
• Build: #OpenBeta
• Devices: #OP3 #OP3T

Changelog
System
• Updated Android security patch to 2018-04

OnePlus Clock
• Changes to alarm background color and other UI changes
• Stopwatch updated with new UI

Oneplus Switch
• Fixed QR Code scan issue
• General bug fixes and stability improvements

Card Package
• Added new membership card in Shelf

Links
• Rom:
OP3
OB34 - Official
OP3T
OB25 - Official | OB25 - GDrive
• Thread: forum.oneplus.com

Oxygen OS Open Beta 8 & 6 for OP5/T is now available

Details
• Version: OB8 (OP5) / OB6 (OP5T)
• Type: #rom
• Build: #beta
• Devices: #OP5 #OP5T

Changelog
Earphone mode
• Added Autoplay - Autoplay paused music when connected to earphones
• Added Notification ringtone options
• Added Broadcast caller information - Announce caller information when using earphones

OnePlus Clock
• Changes to alarm background color and other UI changes
• Stopwatch updated with new UI

Card Package
• Added new membership card in Shelf

System
• Updated Android security patch to 2018-04

Links
• ROM: OP5 Official | OP5 AFH | OP5T Official | OP5T AFH
• Thread: OP Forums - OP5 | OP Forums - OP5T

Credits:
• Thanks to @AndItsTito for the mirror links

OnePlus explains their beta program structure and announces they will accept 100 new testers to their Closed Beta Program, the closest group to OnePlus. The link for applying can be found in the thread below:

https://forums.oneplus.com/threads/the-exclusive-and-mysterious-oneplus-closed-beta-testing-program.820993/#post-18168486

OpenBeta Update for the 3/3T

Details
• Version: OpenBeta 35 & OpenBeta 26
• Type: #rom
• Build: #OpenBeta

Launcher
•Supported double-tap to lock screen
•Improved search history for App drawer

File manager
•Hide lock-box entry in guest mode
•Optimizedscanninglogic for large files

Links:
Rom:
OP3: Official
OP3T: Official
Thread: OnePlus Forums

All the info about incoming OnePlus 6

• Official Launch
• Official Launch CN
• Win a trip to OnePlus 6 Launch
• Event in Mumbai, India 17 may
• Discover your speed

Just a reminder to you guys, we have split our channel into sub-channels based on the devices. Official news from OnePlus and OxygenOS updates for each device will still be posted here, anything beyond that will go to the dedicated channels. There are also discussion groups, called Chatrooms, for 5/5T and 6. Click the quoted post to find the links.

New Oxygen OS update

Details
• Version: 5.1.1
• Type: #rom
• Build: #stable
• Devices: #OP5 #OP5T

Changelog

Hot fix
• Fixed ringtone issue for phone and notifications

System
• Updated system to Android™ 8.1 Oreo™
• Updated Android security patch to 2018-04

Gaming mode
• Added new optimizations in gaming mode including power saving and pausing adaptive brightness

Launcher
• Added category tags in search section of app drawer
• Auto name folders based on category

Links
• ROM: OP5 Official | OP5 AFH | OP5T Official | OP5T AFH
• Thread: Soon

Credits:
• Thanks to @AndItsTito for the mirror links

Join the OnePlus crew at one of the global pop-up events . On top of exclusive swag and games, early birds will also be able to pick up their OnePlus 6 before anyone else. We'll be touring Europe this summer with more swag and games, so be sure to hit us up.

https://www.oneplus.com/6-popups

SultanXDA soon discontinuing development for all OnePlus Devices.

Source

H2OS Update

Details
• Version: Android 8.1
• Type: #rom
• Build: #stable
• Devices: #OP5 #OP5T

Changelog
Launcher
• Add new dynamic clock
• New folder auto naming function
• Add drawer sorting labels to find applications faster
• New drawer quick search on/off settings

System
• Added full screen gestures (5t only)
• Optimize power consumption during game play, save power while playing games
• Actively display new clock style settings

Communication
• Added caller identification information to let you easily identify strange calls
• Support for adding emergency information in profile information

Gallery
• Support photo cloud sync function, no longer worry about lost photos
• Add photo maps to view photos by location
• Add trash feature

Links
• Rom: OP5 | OP5T

Thanks to @obol2

H2OS Update

Details
• Version: Android 8.0
• Type: #rom
• Build: #stable
• Devices: #OP3 #OP3T

Changelog
System
• Add face unlock function to unlock
• Add picture-in-picture, video playback as you like
• Add new auto-fill, no need to remember long passwords
• Added smart text selection to intelligently identify text highlights
• New and quick setting design, better use experience

Gallery
• Support photo cloud synchronization
• Add photo maps to view photos by location
• Image Supported by Shot On OnePlus Share
• Add trash feature

Communication
• Add caller number recognition
• Support for adding emergency information in profile information
• Contacts support alphabet navigation

File Manager
• Newly increased file management function

Links
• Rom: OP3 | OP3T

Thanks to @obol2

Oxygen OS Open Beta 10 & 8 for OP5/T is now available

Details
• Version: OB10 (OP5) / OB8 (OP5T)
• Type: #rom
• Build: #beta
• Devices: #OP5 #OP5T

Changelog

System:
• Updated Android security patch to May

Launcher:
• Added Toolbox Card in shelf
• Added Hidded Space in app drawer
• Added support for editing dynamic icons(weather,clock and calendar)

OnePlus Switch:
• Optimized user interface for backup & restore
• Optimized logic for time remaining
• General bug fixes and stability improvements

Messages:
• Added Group MMS

Links
• ROM: OP5 Official | OP5 AFH
| OP5T Official | OP5T AFH
• Thread: OnePlus Forum

Credits:
• Thanks to @AndItsTito for the mirror links

Oxygen OS Open Beta 36 & 27 for OP3/T is now available

Details
• Version: OB36 (OP3) / OB27 (OP3T)
• Type: #rom
• Build: #beta
• Devices: #OP3 #OP3T

Changelog
System:
• Updated Android security patch to May

Launcher:
• Added Toolbox Card in shelf
• Added Hidded Space in app drawer
• Added support for editing dynamic icons(weather,clock and calendar)

OnePlus Switch:
• Optimized user interface for backup & restore
• Optimized logic for time remaining
• General bug fixes and stability improvements

Messages:
• Added Group MMS

Links
• ROM:
OP3
Official
OP3T
Official
• Thread: OnePlus Forum

Credits:
• Thanks to @AndItsTito for the mirror links

The Speed You Need - OnePlus 6 Launch Event
Livestream: OnePlus | YouTube
Reddit Live thread: Reddit
Discussion group: @op6discussion
News channel: @op6news
Countdown: 00H 00M (Live)