Software

3D modeling/animation (complex) = Blender (Steam)
3D modeling (simple) = SketchUp
3D modeling (voxel/brick) = Magicavoxel
3D modeling (digital clay sculpting) = Sculptris
3D modeling (in VR) = Google Blocks
Human 3D models/armature generator = MakeHuman
Photo editing/manipulation = GIMP
Digital painting/comics = Krita
Vector art (like Illustrator) = Inkscape
Storyboarding = Storyboarder
Video game engine = Unity
Visual novel maker with no code = Fungus (requires Unity)
Text based game = Twine
Audio/sound recording/editing = Audacity
Sheet music notation = Musecore
Retro game music = Bosca Ceoil
Retro game effects generator = BFXR
Screen & webcam recording = OBS
Live streaming (Twitch/YouTube) = Streamlabs OBS
Video & audio converter = Handbrake
2D animation (cutout) = Dragonbones Pro + Synfig
2D animation (drawn) = Opentoonz + Blender
Stick figure animation = Pivot Animator
Stop motion/claymation = Stop Motion Studio
Video editing = Blender
Flashcards/spaced repetition learning = Anki
Distraction free writing = Writer (BigHugeLabs)
Script/play-writing = Amazon Storywriter
Sound Effects Database = Freesound.org
Music for film/games = Incompetech.com/music
Pixel art & animation = Piskel
Textures & HDRIs for 3D = HDRI Haven
Fonts = Google Fonts + 1001FreeFonts.com
Learn coding = Codecademy
Simple Android app maker = AppInventor
Color palette generator = Coolors.co
Rhyme dictionary = rhymezone.com