Bitsy, made by Adam Le Doux, is a small game editor for making worlds to explore. Bitsy is self-contained, easy to use and doesn't require any programming. With it, you can make environments for players to discover, characters for players to talk to, and items to collect. You can play what people have been making over on itch.io, and read about the first year of Bitsy on RockPaperShotgun.
You can find Bitsy on itch.io. There are some basic instructions in the "about" panel when you open it, or you can head to Claire Morley's tutorial for a more in-depth guide!
You can have a look at games collections by Adam Le Doux and Lorenzo Pilia, or browse the itch.io tag. You can also find a list of all Bitsy games ever made on the Bitsy Omnibus, or follow the Bitsy Pieces Twitter account.
Bitsy Talk is a dedicated Discord server for everything Bitsy. You might also want to take a look at the Bitsy Boutique and Bitsy Archive by @ragzouken!