Magisk XDA Release: forum.xda-developers.com/showthread.php?t=3473445

Install, upgrade, manage, configure the Universal Systemless Interface - Magisk within a single app!
Here are some key features:

Status
• Check Magisk Version and updates
• Check root status
• Check SafetyNet
Install
• Select boot image location
• Advanced installation settings
Superuser
• Manage Superuser permissions
• Toggle logging and notifications for each individual application
Modules
• Enable/disable, remove Magisk Module
• Manually add Magisk modules by selecting Magisk Module zip files
Downloads
• Download Magisk Modules hosted on the Magisk Repo
Magisk Hide
• Select the app you want to hide Magisk from
Settings
• Toggle systemless host support
• Toggle Busybox support
• Toggle Magisk Hide
• Tons of Superuser settings

... and much more to come!
From version Magisk Manager 5.8.3:
Variant
Arch
Version
DPI
(noarch)
Latest: 5.8.3 on July 19, 2018
(universal)
Latest: 5.5.5 on January 13, 2018
All versions
July 19, 2018
July 18, 2018
July 12, 2018
July 8, 2018
April 29, 2018
March 28, 2018
March 18, 2018
March 11, 2018
February 21, 2018
February 13, 2018