Layout Builder Operation Link
Adds an edit layout operation link to content admin pages.
Works with nodes, blocks, media, etc.
Modules
Layout Builder
Create custom layouts with sections and blocks.
Layout Builder Simplify
Collapses block list in layout builder sidebar.
Has an issue that breaks creating custom blocks.
Layout Custom Section Classes & Attributes
Allows setting attributes on layout sections.
Layout Builder Widget
Edit content layout from within the edit form.
Layout builder can't show a live preview with this, so it may not make sense to enable it.
Layout Builder iFrame Modal
Open block edit forms in a modal in layout builder.
Ace Code Editor
Use embedded Ace code editor.
Ace is a highly capable code editor for the web.
Media Library Theme Reset
Use your admin theme's styles for media library instead of your own. This means you don't have to spend time styling the media library (if you don't want to).
Paragraph Blocks
Place your content's paragraphs as blocks within layout builder.
Inline Block Title Automatic
Paragraphs don't need a label, but custom blocks placed in layout builder do. Since you're not always displaying the label this can be an extra step in composing content.