PSARCTool by Periander - Extracts and recreates the .PAK files.
MBINCompiler by Monkeyman192 - Decompiles and recompiles the .MBIN files.
Development Tools
AMUMSS (Auto Mod-builder Updater with Mod Script System) by Mjjstral & Wbertro - This tool automates every step of nms modding via .lua scripts. Once translated into a script, mods could be regenerated again in one click. It can also merge mods together, extract .pak files, check any mod conflict and much more...
NMS Mod Builder by cmkushnir - This tool automates every step of nms modding via C# scripts. Once translated into a script, mods could be regenerated again in one click. It can also merge mods together, extract .pak files, check any mod conflict and much more...
NMS-MCDAMM by ronw71 - a No Man's Sky Mod Conflict Detector and mod manager --- edit - compare - merge
NMS Modding Station by Tub0Crisco - This tool eases up the process of putting a mod together by cutting down most of hand made steps. Note: it has PSArcTool built-in!
Assistive Tools and Resources
Assistant for No Man's Sky by Kurt Lourens - This Apple/Android App presents a lot of game data in a more convenient way, like all game recipes, item costs and more.
Cheat Engine by Dark_Byte - a powerful tool to adjust any game variable loaded in memory in real-time but changes made only last the time of your game session.
NMS PCBANKS Explorer-Unpacker This tool included with AMUMSS could search and extract desired files directly from .pak files and browse all the game file structures.
NMS Reward Allocator by GmrLeon - This tool allows to edit or add rewards to any in-game interaction.
NM Seeds by LuckDragon - A player feed seed database for ships, freighter, frigates, multi-tools and NPCs
NMS Translator by Lo2k - Converts both ways all language files into easy to read and edit .txt files.
Outdated Tools
NMS Annotation Script Generator by GmrLeon - These two generators, one for products, tech, & substance tables, and the other for the various mission tables of the game, create scripts that when run annotate the tables with translations from the localization tables for their various localization ids. This makes reading over these different tables significantly easier than jumping back & forth between them and the localization tables.
NMSE (No Man's Sky Script Extender) by Gregkwaste - similar to script extenders in games like The Elder Scrolls: Skyrim, new functionality can be added through NMSE via external scripting. [NOTE: This hasn't been updated since the initial release of the game. If anyone would be interested in reviving this project, many people would be very appreciative!]