Comment picker for edits
104765
Improve the editing flow with predefined options for "Edit Summary"
154556
Comment editing grace period
130885
Information of the user in comments
20441
Is there a way to edit or delete and reenter comments once they're posted?
23614
A method for the OP to accept comments?
72700
Change HTML Produced by wp_list_comments()
26650
Text formatting now allowed in comments (List of proven and disproven abilities)
1163
Comments in Markdown
55618
Option to be notified when a post I downvoted is edited
121821
Commenting Regular Expressions
92539
Inline Editing for Stack Exchange Sites
51469
Allow converting comments to answers
57369
Automatic "fancy" comment insertion with Vim
51711
Link to view the edit history of a question
87776
Allow voting on comments from Review interface
23993
Allow moderators to edit/delete comments directly from the per-user comment moderation page
58991
How do I enable comments for user profiles?