Authoring

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Decker

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)

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Downpour

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

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Hatch

Excellent little multimedia tool for creating interactive thingies. Has stickers, effects, gifs etc.