• Logic Pro version 10.6.2 Update for macOS 10.15.5 or later. (app store link)
  - "This update contains stability improvements and bug fixes".
  The release notes has a very long list of fixes & improvements (some M1 Mac related).
  
  
• MainStage version 3.5.2 Update for macOS 10.15.5 or later. (app store link)
  - "This update contains stability improvements and bug fixes".
  The release notes lists improvements to Stability/Reliability, Performance, Mixer, Plug-ins and Undo. The "General" improvements section has 13 items.

• About the security content of Security Update 2021-002 Catalina
• About the security content of Security Update 2021-003 Mojave
  
  Download Pages for these Updates
• Download Security Update 2021-002 Catalina (1.79 GB)
• Download Security Update 2021-003 Mojave (1.79 GB)

You can check for feedback in Apple's Mojave and Catalina forums.
(Some use the download updater and install from a Safe Mode boot.)

FYI: Posts in Apple's Mojave forum on Security Update 2021-003 fails with ERROR_7E7AEE96CA displayed in dialog with Catalina install "badge". (Mentions cause was using Mojave as a migration source for Catalina on a separate boot partition, leaving the source Mojave volume with a Catalina restore partition. A suggestion was installing macOS 10.14.6 Combo Update, then applying later updates, but this later reply did a fresh install of Mojave on a new partition instead.)
 

This release also fixes the following issues:
• External 4K monitors may not display in full resolution when connected over USB-C.
• Login window may not display properly after restarting Mac mini (M1, 2020).
• Reminders created via Siri may be unintentionally set for early morning hours.
• iCloud Keychain might not turn off.
• AirPods audio routing to incorrect device for Automatic Switching.
• AirPods Automatic Switching notifications might be missing or duplicated.
• The Dwell feature may not work in the Accessibility Keyboard.

If you have trouble installing the update, try updating from Safe Mode.
And if running any 3rd party Security software, disable it before updating.

It's not listed but hopefully this fixes the CVM Server crashes on M1 Macs since v11.2 update.
(Example Apple forum threads here, here & here. Appears related to OpenGL.framework.)

You can check for feedback in Apple's Big Sur forum.
(And for M1 Mac owners, also check the Mac Mini, MacBook Pro, & MacBook Air forums.)
 

• About the security content of Safari 14.1 (use software update)
  - For macOS Catalina & Mojave. (Safari 14.1 revised May 4th for more fixes.)
  
  
• Xcode 12.5 (for macOS 11.0 or later)
  - See linked App store page for what's new in Xcode 12.5.
  (Supports iOS/iPadOS 14.5, tvOS 14.5, watchOS 7.4, macOS Big Sur 11.3.)
• About the security content of Xcode 12.5
  
  
• iOS 14.5 release notes
• iPadOS 14.5 release notes
• About the security content of iOS 14.5 and iPadOS 14.5 (long list)
  
  
• watchOS 7.4 release notes
• About the security content of watchOS 7.4 (long list)
  
  
• tvOS release notes updated with 14.5 info.
• About the security content of tvOS 14.5 (long list)
  
  
• Apple TV (3rd generation) Software Update 7.7
  - "This update includes general performance and stability improvements".

• macOS Server 5.11.1 (Requires macOS 11.3 or later)
  - Profile Manager performance improvements.
  - New restrictions for Unpaired External Boot to Recovery & Unlock with Apple Watch.
  - Support for Xsan management is now included in macOS Big Sur.
  - learn more about migrating to the new tools (PDF).
  
  
• All-new iMac, iPad Pro, and Apple TV 4K orders start April 30 (pr)
  
  
• Pixelmator Pro version 2.0.8 (app store link, macOS 10.14.4 or later)
  "v2.0.8 brings full support for LUTs. So you can now apply the color adjustments made using Pixelmator Pro to other graphics and video apps, such as Final Cut Pro, import and export LUTs, and even convert LUTs into color adjustments using machine learning."
  
  
• What's new in Apple Configurator 2.14
  New restrictions for Unpaired External Boot to Recovery & Unlock with Apple Watch.
  
  
• Total War: ROME REMASTERED released (feral interactive)
  
  
• Apple Reports Second Quarter Results (pr)
  - Services and Mac revenue reach new all-time high.
  
  
• Clips version 3.1 adds immersive new AR Spaces (pr)
  - Requires iOS 14.5/iPadOS 14.5. Recording HDR video requires iPhone 12.
  
  
• iOS 14.5 delivers Unlock iPhone with Apple Watch, more Siri voice options, & new privacy controls (pr)
  
  
• Apple commits $430 billion in US investments over five years (pr)

• What's new in macOS Server (added v5.11.1 info)
  
  
• Safely open apps on your Mac
  (originally titled "About Gatekeeper")
  
  
• If you see a warning symbol on Apple TV
  (was originally titled "Restore your Apple TV".)
  
  
• How to uninstall iOS beta software
  
  
• Transfer photos and videos from your iPhone, iPad, or iPod touch
  
  
• Apple Music & Privacy
  
  
• About privacy information on the App Store and the choices you have to control your data
  
  
• Set up and use Magic Keyboard for iPad
  
  
• Recognize and avoid phishing messages, phony support calls, and other scams
  
  
• What's new in Apple Configurator (added v2.14 info)
  
  
• How to create a bootable installer for macOS
  
  
• Check your Apple ID device list to see where you're signed in
  
  
• Pair an Xbox controller to your Apple devices
  
  
• Connect a wireless game controller to your Apple device
  
  
• If your Mac starts up to an Apple logo or progress bar
  
  
• Listen to the radio in the Apple Music app
  
  
• Download the Apple Music app if your country, region, or device doesn't have Google Play

• Yamaha Steinberg USB Driver v3.0.5 for macOS 11 Big Sur
  - the 3.0.5 driver version requires macOS Big Sur - see notes.
  (The previous 2.0.5 driver supports macOS 10.13.6 to 10.15.)
  
  
• Chrome 90.0.4430.93 Stable Channel Update (with 9 security fixes)
  
  
• About the security content of iCloud for for Windows 12.3
  
  
• About the security content of iTunes 12.11.3 for Windows
  
  
• Freeware VM VirtualBox 6.1.22. See Change Log for details.
  (April 20th version 6.1.20 update included an Audio fix for macOS.)
  
  
• 03.11.15 Firmware Update for 2021 LG C1/G1/R1 OLED TVs
  - post includes info and download pages.