That's an interesting question we thought to answer you guys.
We use,
Game Engine - Unity
Coding (C#) - Visual Studio/Rider
Cloud Save & Repositories - GitHub, Plastic SCM
2D Art - Photoshop, Illustrator
3D Modelling - Blender, Cinema4D
3D Modelling (Voxel Art) - Magica Voxel
Sculpting - ZBrush
Texture - Substance Suite
3D Animations - Blender
2D Animation - Adobe After Effects
Audio - FL Studio, Audacity, BFXR
Trailer & VIdeos - Adobe Premiere Pro, Wondershare Filmora
Hope this helps. However, as we have our in-house developers and artists to make required assets, we craft it from scratch than searching it from anywhere else. Also, as we found it really difficult to get one from the internet, we have a growing library of Free Game Assets that you can check for uplifting your game project to new heights and boosting your Game Development journey.