Filosofo Comments Preview lets you preview WordPress comments before you submit them.
The plugin is old, but still works flawlessly. It is easy to install, the output can be fully styled and it plays nice with other plugins.
It would be great to have a few more integration options out of the box (button, colors, nested comments). If need be they can be handled manually though.
Recently, I find myself using it less and less due to its age and those missing features... Yet it is still worth a recommendation!
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