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cheat
cheat allows you to create and view interactive cheatsheets on the command-line. It was designed to help remind *nix system administrators of options for commands that they use frequently, but not frequently enough to remember.
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snippet-box
Snippet Box is a simple self-hosted app for organizing your code snippets. It allows you to easily create, edit, browse and manage your snippets in various languages.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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Joplin
Joplin - the secure note taking and to-do app with synchronisation capabilities for Windows, macOS, Linux, Android and iOS.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You are looking for cheat.
I also stumbled upon snippet-box the other day, I've spun it up briefly and could be nice!
Or there's the closed source ObsidianMD where you have to set up your own syncing of the plain files, I use Syncthing for this between a few machines, including my phone.
See Joplin for a open source markdown mot app, you can sync it in multiple ways like webdav, nextcloud and Joplin server.