Highlight Comments by the Post Author
Gives replies written by the author of the post a colored left border so readers can spot them in long threads.
Snippet Library
Comments snippets for WordPress
Snippets for WordPress comments: fight spam, close comments on old posts, remove the website field, change the comment form and moderate faster. For bloggers and publishers who want useful discussions without the noise.
Move the Comment Box Below the Name and Email Fields
Reorders the comment form so visitors fill in their name and email before writing the comment, the order many themes used before WordPress 4.4.