Show HN: Munin – open-source headless HubSpot alternative

- HubSpot is a dominant all-in-one marketing, sales, and CRM platform widely used by businesses but criticized for its high cost (often thousands per month) and vendor lock-in. - Munin is a new open-source alternative described as "headless" — meaning it provides the backend data and logic (contacts, deals, pipelines, email tracking) but lets users build their own frontend or use an API, rather than forcing a rigid UI. - Being "open-source" means its source code is publicly available, free to self-host, and modifiable, appealing to developers and companies wanting to avoid SaaS subscription fees and data control issues. - The project targets startups and small-to-medium businesses that have outgrown spreadsheets but find HubSpot prohibitive; it competes in the growing "open-source CRM" space alongside tools like Twenty and SuiteCRM.