Tools You Might Need.

Notepad++: A simple but good enough Text editor
Sublime Text: A more advanced text editor, very useful for coding, has paid and free option
WinMerge: Tool for comparing and merging files
Everything: A simple but pretty good search engine that gets the job done
Agent Ransack: an advanced search engine for power users

Paint.net: Tool with DDS export functionality
Renderdoc: Graphics debugger very useful for figuring out what dds format your photo is in
Miru's 010 Editor Scripts For .rpack injection and .rpack extraction, which needs to be done to use the injecter

Daemon's RP6L Unpacker For .RPACK archives (textures and meshes) is very useful since it can convert Dying Light 2 meshes to an openable format in Blender with the use of the XNALara plugin
XNALara: Compatible with Blender 3.6 and earlier versions for .ASCII meshes
Dying Light 1 Developer Tools: For .FBX conversion to .MSH and in general useful since some of things done in dl1 dev tools can be brought to DL2 You need to own the game to get acces to it but in the future that might change

Steffens Binsloc Tool a simple tool that would allow us to edit the binsloc file, which contains the text Dying Light 2 uses. So, in summary, we can edit text with this tool
SDavidLee's Binsloc Tool a more advanced version made by SDavidlee It can output text in various formats such as .txt, .csv, and .xlsx. Additionally, its unpacking and packing processes are more convenient. You just need to drag the .binsloc or modified text file (.txt, .csv, .xlsx) onto the unbinsloc.exe program, and it will automatically perform the operation, saving you time and effort.

QuickBms: For unpacking/packing .AESP archives, currently cant repack aesp archives but will hopefully get that to change
VGMUI: For playing and converting .WEM (DL2) files