Cirrus – takes control of iCloud, investigates and diagnoses its problems

Cirrus has four main functions. It can download and evict (from local storage) items stored in iCloud so that you can manage them properly. It provides full details about files and folders held in iCloud. It performs a test file upload, which can help unstick pending uploads. It also provides specialised access to iCloud-related log activity. New iCloud Browser gets info straight from iCloud, works with Desktop & Documents Folders option, saves detailed reports, and runs on El Capitan too (except log feature). New version fixes time formatting, and improves performance of log views.
Cirrus 1.9 (Intel only for El Capitan, Sierra, High Sierra, Mojave, Catalina and Big Sur)
Cirrus 1.10 (Universal App for El Capitan, Sierra, High Sierra, Mojave, Catalina and Big Sur)
Cirrus 1.12 (Universal App for Sierra, High Sierra, Mojave, Catalina, Big Sur and Monterey)

Bailiff – menubar control over whether iCloud documents are kept in local storage

Bailiff is a simple menubar app which lets you evict iCloud files and folders from local storage, or download them when you want. Saves your Mac’s startup disk from getting cluttered with files you don’t want or use.
Bailiff 1.4 (Intel only for El Capitan, Sierra, High Sierra, Mojave and Catalina)
Bailiff 1.5 (Universal App for El Capitan, Sierra, High Sierra, Mojave, Catalina, Big Sur and Monterey)

Known issues:

Cirrus must be run as an admin user if you wish to use its log browser window. This is because obtaining log extracts uses the log show command, which only works reliably when run as a admin user.

Cirrus 1.11 and later no longer support El Capitan. If you want to use Cirrus on El Capitan, stick with version 1.10.

Articles:

Cirrus 1.12 and Taccy 1.14 fix time issues and improve log performance
Bugs and problems in the log: updates for 6 apps
Bailiff version 1.5 is a Universal App
Cirrus version 1.10 has an improved interface and is a Universal App
How to reveal ‘private’ messages in the log
Testing iCloud using Cirrus
Cirrus version 1.9 has several important improvements
Cirrus 1.8 restores full function in Catalina betas
Cirrus 1.7 now copes with custom paths to iCloud Drive
Bailiff version 1.4 checks its own code integrity and is ready for Catalina