This is now a Theme Component, the plugin is deprecated
The new Topic is Topic List Previews Theme Component - theme - Discourse Meta
See further here: Pavilion
Examples: check out the list further down.
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Maintainers: @merefield
Overview
Topic List Previews allows you to:
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Add images, excerpts, buttons and topic stats to topic list items; and
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Change the layout and style of topic list items
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Add ‘Featured’ topics above topic lists and topics.
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Add User Wall to User’s activity page (aka ‘Portfolio’ Feature).
These settings can be applied to all or selected topic lists on a site-wide or category-specific basis.
This flexible feature-set allows you create a variety of different topic list styles, including
Basic Style
Relevant settings
- topic list thumbnail
- topic list excerpt
- topic list action
Pinterest (Masonry) Style aka ‘tiles’
Relevant settings
- topic list tiles
- topic list thumbnail
- topic list excerpt
- topic list action
- topic list thumbnail width
- topic list thumbnail height
Featured Images
Relevant settings
- topic list featured images tag
- topic list featured images count
- topic list featured width
- topic list featured height
- topic list featured title
- topic list featured excerpt
- topic list featured order
The main and Discovery settings are in Settings → Plugins. The Category equivalent are in each Category’s Settings.
Examples in the Wild 
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Nature Photographers Network, who also use “Featured Topics”.
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Real-Time VFX, who use thumbnails and excerpts.
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SE23.life, who use thumbnails with some custom css.
More info:
Much more info available at: Pavilion
Contributors 
Many folks have contributed to the development of this plugin through both feedback and direct development work. In particular: