Tools
I did not use all these tools here but some of them ..and the rest might feel cool to you too. I saved them over the years so I want to share them with you
Here is my selection:
Small Game Engines
- Bitsy ~ a little engine for little games, worlds, and stories ~
 - Bitsy 3D - bitsy but in 3D :O
 - Bipsi - a bitsy like
 - Decker interactive multimedia
 
Best Quality of Life Tools
- Materialize open source for making PBR materials out of a single texture
 - BackPakcer A channel packing application for 3D material image files
 - MagickUtils A ImageMagick a graphic way (GUI) of editing multiple images (also convert .heic format to .jpg so your pc can work with the images from an iphone.
 - ShoeBox Texture Ripper
 - PureRef easy all you want referance software
 - cutsy clip and covert videos
 
Dithering
- dither me this
 - ordered dither maker
 - didder An extensive, fast, and accurate command-line image dithering tool.
 - Ultra Effects | Part 9 - Obra Dithering An article about shaders
 - Ditherpunk a article about monochrome image dithering
 - Ditherpunk a dev-log article about real-time 3D dithering
 - Hypnospace productivity lesson #1 Make your graphics look like crusty old web graphics by Jay Tholen (can also be done in aseprite now under Sprite-Color Mode-More Options-and then there is dithering selection like this
 - How to paint with dithering in aseprite
 - Ditherpunk a dev-log article about real-time 3D dithering
 - Dither in 3D another approach and good explanation of Lukes Method about real-time 3D dithering
 
Hypertext langues and interactive fiction
- Yarn Spinner for books make choose your own adventure books with it
 - Adventureon Classroom Create TEXT ADVENTURE games in your browser.
 - Inform 7
 - Calibo
 - ink
 - binksi bipsi + ink
 - BITSY + TWINE a article about combining bitsy and twine
 - PowerQuest a unity adventure framework with great dev posts
 - TweeVee a HTML Bandersnatch Video choice
 
Pixel Art Tools
- Pixel Unwrapper UV unwrapping for pixel art. Add-on for Blender
 - Pribambase Blender works with Aseprite now. Add-on for Blender
 - cleanEdge a pixel art upscaling algorithm for clean rotations
 - Sprite Stack or
 - Stacked Sprite Viewer for Aseprite
 - Aseprite Extensions by ThKasparr
 - Pixel Art Tutorials by Saint 11 will got you covered even though its not a tool
 
3D Tools / Blender Addons
- ReSprytile Blender add-on for building tile based worlds 3D Pixel Art or Crocotile3D
 - Magica Voxel - best Voxel art programm
 - Pixel Unwrapper - UV unwrapping for pixel art. Add-on for Blender
 - DreamUV Blender add-on reusable textures like tiling textures, trimsheets, hotspot and texture atlases
 - fSpy for matching perspective
 - complify compostion and lighting made with Ian Hubert
 - MinionsArt 3D stylized Tutorials espieccally the lazy unwrappings one
 
Pico 8 Tools
- Wobblepaint
 - PicoCAD
 - picoSynth
 - PicoShop Pro
 - SCUMM 8
 - Music Theory for making music in pico 8 with the build in tools
 - Picotron cant wait what this fantatsy workstation will do
 
Webmistress
- Sheet Sites by Chia Amisola on how to use google sheets as an easiy collaborative database
 - Use Google Sheets for phone friendly webapps (using a third party service) but its just a hobby
 - CSS for CSS Baby 1-5 by eev.ee
 - How to Build a Low-Tech Website
 - XOXO Festival Talk by Molly white Web3 is a dumpster fire
 - HTML is for people (I like Markdown more ;))
 - A guide for Eleventy as a static site generator so the blog posts can be written in markdown
 - CSS Flexbox Froggy learn CSS
 - Leaflet for javascript map editing on Open Street Map
 
Live Coding
I got no idea but think this is cool. Can also be done in pico 8
- Tix.Land as a simple entry
 - Cables
 - Livecodelab
 - Hydra Objack
 - Awesome Livecoding Collection
 - Awesome (Live) creative coding Collection
 - A sample of what stuff you can do with VFX in Unity
 
Terrain & Heightmaps
You will never get 1pixel = 1 meter but there are quality diffrences between usablity and resolution. These are the best / easiest tools I could find. There are a lot of tools out there for ARMA or Cities Skylines. Gaming is your friend here.
- Earthexplorer easiest high quality goverment aided heightmap tool
 - UNREAL PNG Heightmap is super easy to use
 - ImageJ with Libarys is Fiji and very helpful for giant PNGs
 - ImageJ with Libarys is Fiji and very helpful for giant PNGs
 - ARMA Community Qgis how to handle special heightmap files that are no PNGs
 - TerraForge3D for when it can be procedural and not from the real world
 
Inspiration
- Same. energy As a more effortless search for similar stuff like Pintrest
 - are.na Artsy Organization Community
 
Maps
- Electric Zine Maker
 - Hammer++ updated Source Level Editor
 - TrenchBroom Level Editor
 - Quad64 a open source Super Mario 64 level editor
 - Spout for realtime usage of video in for example godot
 - Shade for IOS Visual Shader black magic app just like unity, unreal or godot
 - sumatra pdf reader a reader that does not sell you anything and its lightweigt
 - Kopia Open Source File Backup with UI an active open source file incremental and full file backup client. Here is a Bonus Tip
 - GB Studio
 - Derivative as a Art Light Installtion Software