Update 4/23/18: The Xiaomi Mi Max 2 now also has official TWRP support. The download link has been added below.
Team Win Recovery Project (TWRP) is the most popular custom recovery for Android devices. Having TWRP support (or another comparable custom recovery) is a necessity for the health of a custom ROM scene. Without a custom recovery, it would be risky for users to flash any custom ROMs, acquire root access by modifying the boot image, and difficult to install modifications because of the ease of custom scripts. Many devices receive an unofficial build of TWRP shortly after a device is released and kernel source code is made available. Having an unofficial build become official signals that the maintainer is committed to keeping the recovery up to date with the latest changes in TWRP and that the build will be made available on the official website. The latest devices added to the official roster include the Xiaomi Mi Mix 2, the MediaTek variant of the Motorola Moto E4 Plus, and the Alcatel Telekom Puls.
You can visit the official XDA forums for some of the mentioned devices below.
Xiaomi Mi Mix 2 ForumMotorola Moto E4 Plus Forum
If you are interested in downloading and installing the builds, check out the official webpages with the download links down below or download the official app via the Play Store to download and flash the build if you already have root access.
Download TWRP for the Xiaomi Mi Mix 2Download TWRP for the MediaTek Motorola Moto E4 PlusDownload TWRP for the Telekom Puls
The custom recovery will also soon officially support the Planet Computers Gemini PDA according to the latest commits to the website which have yet to be merged. If we spot more devices added to the TWRP roster, we will let you know about them here on XDA.
Update: Official TWRP support for the Xiaomi Mi Max 2 is also included. Download and forum links found below.