SEO
The standalone [open-seo](#apps--tools) (Semrush/Ahrefs alternative) is an app, not a plugin.
claude-seo plugin A free MIT-licensed Claude Code plugin that audits technical SEO, content quality, structured data and AI search readiness. marketingskills skill A free MIT-licensed collection of marketing skills for Claude Code covering conversion optimization, copywriting, SEO and analytics. claude-blog plugin Claude Code plugin that researches, writes, SEO-checks and reviews blog posts, with 32 skills and 5 agents. Free on your Claude plan; optional paid Gemini for images. Install v2.3.0 or later.
Social Content
Humanizing tools such as [humanizer](#style--fiction) are listed under Writing.
instagram-agent-skill 13 skills Thirteen free Claude skills for running an Instagram account, including a Reel writer with 26 hook formulas and hook scoring, a niche virality ranker, caption and profile skills; nothing is posted without your approval. reddit-automation skill Skill that finds Reddit threads where people are shopping for what you sell and drafts helpful replies for you to review and post by hand. xiaohongshu-mcp MCP An Apache-2.0 MCP server that lets Claude Code search, read and publish on xiaohongshu.com (RedNote), including likes, favorites and comments. Publishes and comments from your account. baoyu-skills skill 20+ skills for content work such as comics, infographics, image generation and posting to X, WeChat and Weibo. Posting uses your logged-in browser; image skills call paid third-party APIs. linkedin-skills 12 skills Skills that draft LinkedIn posts, comments and replies in your voice and wait for your approval. Optional paid Apify (scraping) and Publora (auto-posting).