LinkWhisper

LinkWhisper is a WordPress plugin that reads your posts and suggests relevant internal links, which you can insert one at a time or in bulk. It also finds orphan pages that nothing links to, helping site owners improve SEO structure without manual audits.

Suggestions appear in the WordPress editor while you write, and a report lists every post with its inbound and outbound link counts. Bulk tools let you add links to existing content across the whole site from one screen.

It is sold as a paid plugin licensed per site, with entry pricing from about $10 a month according to the site. It suits bloggers, affiliate sites and content teams that publish at volume on WordPress.