Instead of making a long list of software that supports Windows 7, I'm making a list of software that doesn't work with Windows 7.
There are four categories, the first is: Windows 10+ only, the second is: Windows 8+ only, the third is: Requires modification to work on Windows 7, and the fourth is: Unofficially works on Windows 7.
There's likely plenty more software that isn't listed here, so let me know if any Windows 8+ only software gets any mods that lets it work on 7, or any new 8+ or only officially supports 8+ software comes out.
Windows 10+ only:
Games:
Assassin's Creed Valhalla
Death Stranding (DirectX 12 only, missing a few APIs, and has an OS block)
Forza Horizon 4 (UWP)
Horizon Zero Dawn (Same as Death Stranding, but has no OS block, or at least a older patch doesn't)
Microsoft Flight Simulator
Minecraft Bedrock (UWP)
Sea of Thieves (Matchmaking backend comes from Microsoft Store)
Six Ages: Ride Like the Wind
Other:
Facebook Messenger app
iTunes
Microsoft Office 2019 (Unofficially works on 8.x)
NVIDIA Broadcast
Oculus Setup/App
Presonus StudioOne v5 (Might unofficially work on 7/8, but untested)
Windows 8+ only:
Game clients:
EA Desktop Beta (Requires a 8.x dll, also, the installer has a block that blocks anything under 8.1, and application verifier does not work)
Other:
Kingston SSD Manager
Requires modification to work on Windows 7:
Games:
Crysis Remastered (You should probably play this with DXVK. This happens without DXVK)
Back 4 Blood Alpha (Requires xinput1_3.dll from C:\Windows\System32 to be copied into the same folder as the game .exe and renamed xinput1_4.dll)
Mafia: Definitive Edition (Requires DXVK to run. More info here)
Mafia II: Definitive Edition (Requires xinput1_3.dll from C:\Windows\System32 to be copied into the same folder as the game .exe and renamed xinput1_4.dll)
Need For Speed Heat (Requires modifying the Origin launcher)
Postal 4: No Regerts (Unreal Engine bug. It requires a fix that the developers of the game posted)
Star Wars™: Squadrons (Same fix as Postal 4)
System Shock Remastered (Same fix as Postal 4)
Other:
Discord (Intentionally breaks screenshare audio on anything below 10, fixed by using a browser or application verifier)
Python 3.9.0 (https://msfn.org/board/topic/181979-another-program-drop-the-support-python-390/?tab=comments#comment-1189117)
VMware Workstation 16 (Requires a custom installer and replacing vmware-vmx.exe)
Unofficially works on Windows 7:
Game clients:
GOG Galaxy 2.0 (1.2 is superior and supports 7 officially)
Games:
Anthem
Battlefield 4 (Says it requires Windows 8 on Steam, likely a mistake as Battlefield 3, 1, and V all officially support Windows 7. Though Windows 8.x is known to perform better than 7 in game, so that might be why)
Boneworks
Command & Conquer™ Remastered Collection
Crusader Kings III
Death end re;Quest 2
Destroy All Humans! (Minimum OS is listed as 10, but in additional notes, it says it supports Windows 7 and 8.1. These guys forgot what minimum requirements mean)
Detroit: Become Human (Is a Vulkan game, but Windows 10?. People say it actually works better on 7 than on 10)
Disintegration (Was patched to fix issues with Windows 7, but minimum requirements still say Windows 10)
Doom 64
Empire of Sin
Fall Guys
Madden NFL 21
Need for Speed Hot Pursuit Remastered
Persona 4 Golden
Phantasy Star Online 2 (According to Steam, it's DirectX 9.0c, but Windows 10+?)
ReCore: Definitive Edition
Rust (Game that used to support Windows XP, DirectX 9, DirectX 11, OpenGL, and Vulkan in early access, but now "requires" Windows 8.1 and only supports DirectX 11 and 12)
State of Decay 2
Trials of Mana
Watch Dogs: Legion
Other:
.NET Framework 4.8.1
Anki
Audacity
Blender 3
Calibre 6.0+
CorelDraw 2021
Cryptomator v1.6.x
Dolphin v16393+
EA Desktop
EasyBCD 2.4
Firefox latest
Google Drive
iTunes 12.11
iZotope RX 10
Kingston SSD Manager
Kodi 21
Microsoft Teams
Mindview 8
MKVToolNix 67
MotionController0669
Mozilla VPN
MySQL
MySQL Workbench 8
OBS
OneDrive
OneNote app
OpenExpert
Paintnet 5.0+
PCSX2
PerfectDisk
Photoshop 2023
Presonus StudioOne v5
Process Monitor
Python 3.9+
QMMP version 2
Rebelle 5
Steam
TCPView 4.x x64
Ubisoft Connect
Vidcoder 7
Visual Studio Code
vmware player 16
VQProbe
Windows Mixed Reality
Xbox App
Yuzu emu EA-2686+
ZBrush