Saturn NiD datamining and ripping tools:

PRS decompressor:

https://github.com/FraGag/prs.net

Sprite viewer for Saturn NiD:

https://github.com/mg35/NiDTextureExplorer 

Tool for Importing 3d models from the Sega Saturn game NiGHTS into Dreams into Unity3d:

https://github.com/AndreasScholl/NiGHTSImporter

Ending card images decompresser:

https://github.com/foreverWIP/NEID

Software for loading Sega Saturn games into Ghidra:

https://github.com/VGKintsugi/Ghidra-SegaSaturn-Loader

Links to other Sega Saturn Saturn Utilities 

https://cyberwarriorx.com/saturn-utilities

NiD HD datamining and ripping tools:

Asset ripping tool for NiD 2012 port:

https://github.com/mg35/NightsImageTool

NiD HD PC mod loader:

https://github.com/Reloaded-Project/Reloaded-II

NiGHTS into Dreams HD .DDM Exporter/Importer (by lily_falling_apart)

https://drive.google.com/file/d/1FllJfay6mYVCn9B12TfagYejMyHbNk3O/view?usp=sharing

JoD datamining and ripping tools:

NiGHTS JoD .one archive unpacker (by Kentilan)

https://drive.google.com/file/d/17lvIXa_EVm4XqTLjSPjBo4e4wZXSe7JL/view?usp=sharing

Tool for opening CSB audio files

https://github.com/blueskythlikesclouds/SonicAudioTools/releases/tag/v1.0.1

Brawlbox for opening .tpl and .br_ files (discontinued)

https://github.com/libertyernie/brawltools

Brawlcrate (Brawlbox fork)

https://github.com/soopercool101/BrawlCrate

BRRES viewer for .br_ files

https://gamebanana.com/tools/6293

ncp2txd - tool for extracting textures from gncp files

https://drive.google.com/file/d/1beMFo0py9gcnwR9BMWi0j1NA77_iJFbf/view?usp=sharing

Kunai - GNCP UI editor (can’t load JoD textures but still can view UI boxes and animations)

https://github.com/NextinMono/kunai

Shuriken - another GNCP UI editor alternative. Needs to be build

https://github.com/SKmaric/Shuriken

Other tools:

Tool for unpacking and repacking S&ASRT game data

https://github.com/Tyaap/ASRT_SumoTTP