Groundhogg
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Groundhogg is an open-source CRM and marketing automation platform built directly into WordPress. You manage contacts, track customer behavior, build email workflows triggered by actions, and run campaigns without leaving your dashboard. All data stays on your own server, and the core plugin is free with optional premium add-ons for advanced features.
It works best for small to mid-sized businesses that want marketing automation without moving to a third-party SaaS platform. Unlike lighter plugins, Groundhogg gives you contact segmentation, automation rules, and sales pipeline tracking all in one place, making it a genuinely standalone alternative to external platforms.