Here's a list of Slate plugins, organized by category, so that they're easier to find than searching NPM or Yarn.
Behavior
Plugins that add specific behaviors to your editor.
Automatically transform certain input as a user types.
Collapse the selection when users hit esc.
Allows users to insert images by drag-dropping or copy-pasting.
Adds blockquote editing behaviors to an editor.
Adds code block editing behaviors to an editor.
Adds footnote editing behaviors to an editor.
Adds list editing behaviors to an editor.
Adds common table editing behaviors to an editor.
Prevents documents from being empty.
Automatically linkify URLs when they are pasted.
Adds soft breaks when users hit enter.
Changes the inline node behavior to allow editing at the edges.
Displays inline auto-completed suggestions.
Ensure that documents end in a specific kind of block.
Components
Components for building Slate editors.
A set of icons for using in toolbars, etc.
Serializers
Serializers for handling Slate data.
A base64 string serializer for Slate documents.
An HTML serializer for Slate documents.
A plain text serializer for Slate documents.
Utils
Useful utilities when working with Slate documents and components.
Prints Slate documents in their slate-hyperscript
format.
Allows you to express Slate documents in JSX.
A set of prop types to use in your Slate components.