Simply typing in the name of your snippet (or line of code) will display the snippets you saved. You can either arrow-down or click a snippet to insert it where the cursor is in your text document or ...

That preview can be taken full-screen too. The editor has code-completion suggestions, project-based search, keyboard support, a snippets library of SwiftUI interface elements, and Swift Package ...

If they're really just snippets and not actual methods / classes that can be easily reused, you could try just distributing them as code snippets into the IDE (e.g. Visual Studio Code Snippets).