Authoring

Leaflet

• Authoring
• Web

Nice way to make pages, with images and navigation Nice.

MIT AppInventor

• Authoring
• Coding
• Visual

Create mobile apps using "block-coding"

WickEditor

• Animation
• Authoring
• Game

Fabulous web-based animation and game-making tool

Twine

• Authoring
• Games
• Interactive Narrative
• Writing

Write interactive narrative fiction (the online version). Create your own adventure game!

Downpour

• Authoring
• Games
• Gamification

Fun mobile app (Android, iOS) with which you can make quirky games.

OctoStudio

• Authoring
• Coding
• Visual

Fabulous Scratch-based authoring system (on mobile) that has better connection to the devices gyroscope, camera, light etc.

Decker

• Authoring
• HyperCard

Based on Hypercard, this web-based authoring tool looks great. Except the Lil language is, er, not to my taste at all... And you can't (or I can't) just make a stack's size to be fullscreen... and why the hell does the UI fetishize Hypercard, rather than ape it brilliance. I could imagine making wonderful 1bit stuff with this, but it's LOCKED into recreating zombie Hypercard stacks rather than giving them new life. (imo)

Alice 3

• 3D
• Authoring
• Visual

Amazing 3D tool. You can create scenes and interactions using Scratch-like coding.

A Frame

• 3D
• Authoring
• VR

A web framework for building virtual reality experiences

Aframep5

• 3D
• Authoring
• P5JS

A brilliant Javascript p5js library that is integrated with A-Frame so that you can generate A-Frame objects but using the more familiar format of p5js.

CardStock

• App Making
• Authoring
• HyperCard

Callooh! Callay! A HyperCard clone that doesn't suck AND has programming in Python (rather than HyperTalk). Brilliant!