DRV3-Sharp

DRV3-Sharp is the main multipurpose tool used to extract and modify Danganronpa V3: Killing Harmony's files. The most recent release can be downloaded here.

DRV3-Sharp is capable of the following:

Unpacking .CPKs
Unpacking/repacking .SPCs
Extracting textures and models from .SRDs, .SRDIs, and .SRDVs
Unpacking/repacking .STXs
Unpacking/repacking .WRDs from .SPCs
Pairing .WRD-containing .SPCs with their matching .STX-containing counterparts, and unpacking/repacking them in tandem

This means it can help you with:

Changing the contents of most of DRV3's file archives
Viewing images and 3D model files
Changing the game's text
Changing the game's scripting