Feel free to add, correct, edit and update - it’s a wiki.
DAWs
Audacity
While the official system requirements only mention MacOS versions up to Big Sur, this forum post suggests it works fine with Monterey.
Hindenburg
“MacOS versions 10.10 and up” are compatible, Monterey-compatibility explicitly confirmed by Hindenburg engineer
ProTools
Pro Tools Operating System Compatibility Chart
Reaper
“REAPER supports macOS 10.5* to macOS 12.”
Plugins
Izotope
Officially supported:
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RX 9 Advanced/Standard
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RX Pro for Music
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Ozone 9 Advanced/Standard/Elements
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Ozone Pro
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Neutron Pro
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Neutron 3 Advanced/Standard
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Tonal Balance Control 2
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Insight Pro
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Nectar 3 Plus
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Nectar Pro
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VocalSynth 2
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VocalSynth Pro
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Neoverb
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Neoverb Pro
“We are currently in the process of testing compatibility for the rest of our product line.”
Other Software
BlackHole
Some users report that it works, others that it doesn’t.
According to the developer, BlackHole works with MacOS Monterey without issue.
Officially, Compatible with macOS Mavericks (10.9) and newer.
Descript
“macOS 10.11 (El Capitan) or later”
Røde Central
Røde Connect
Rogue Amoeba
“no known issues” for Audio Hijack, Farrago, Fission, Loopback, Piezo, and SoundSource. “No major issues” for Airfoil.
Hardware
… add USB mics or interfaces…