There are many tools, requiring varying amounts of technical savvy, for creating and sharing interactive narratives (and digital games). Here are some that I've come across. McGill Libraries has an excellent list, here, with these and others: http://libraryguides.mcgill.ca/eLkit/gaming. I also quite like this list, with commentary: https://emshort.blog/how-to-play/writing-if/
Adrift - Adventure Development & Runner - Interactive Ficton Toolkit
ADRIFT is different by being a completely GUI driven application, designed to be intuitive and easy to use. ADRIFT also has a long standing reputation for being the easiest system to use for creating interactive fiction.
Bitsy
Bitsy is a little editor for little games or worlds.
the goal is to make it easy to make games where you
can walk around and talk to people and be somewhere.
Choice of Games
ChoiceScript is a simple programming language for writing multiple-choice games (MCGs).
Choose Your Story
ChooseYourStory.com is a community-driven website centered on Choose-Your-Own-Adventure style storygames.
inklewriter
inklewriter is a free tool designed to allow anyone to write and publish interactive stories. It’s perfect for writers who want to try out interactivity, but also for teachers and students looking to mix computer skills and creative writing.
Quandry
Quandary is an application for creating Web-based Action Mazes. An Action Maze is a kind of interactive case-study; the user is presented with a situation, and a number of choices as to a course of action to deal with it. On choosing one of the options, the resulting situation is then presented, again with a set of options. Working through this branching tree is like negotiating a maze, hence the name "Action Maze".
Quest
Quest lets you make interactive story games. Text adventure games like Zork and The Hitchhiker's Guide to the Galaxy. Gamebooks like the Choose Your Own Adventure and Fighting Fantasy books. You don't need to know how to program. All you need is a story to tell. Your game can be played anywhere. In a web browser, downloaded to a PC, or turned into an app.
Squiffy - a simple way to write interactive fiction.
Squiffy is free and open source. It creates HTML and JavaScript, so you can upload it to your own website, or you can upload your games for free to textadventures.co.uk. You can also turn your game into an app using PhoneGap.
Twine
Twine is an open-source tool for telling interactive, nonlinear stories.
h5p
H5P makes it easy to create, share and reuse HTML5 content and applications. H5P empowers everyone to create rich and interactive web experiences more efficiently - all you need is a web browser and a web site with an H5P plugin.