Civil Comments is a subscription service that lets you host civil discussions and debates on your site without the usual spam, harassment, and abuse.

Empower your users with a convenient tool to conceal comments by trolls and other annoying commenters.

FeenBan is a WordPress plugin for shadowbanning / hellbanning commenters.

MarkTroll is a WordPress plugin that will let you shadowban (hellban) any unlogged (regular) commenter on your blog.

Easily control who can comment and when they can comment on any post type.