Buffer is a clean, no-nonsense way to schedule social posts: queue content across several networks, line it up on a calendar, and let it publish while you do other things. For a small team running a handful of accounts it is calm and predictable. The pinch comes from how it is priced - by channel. Each connected social account is a separate slot on your plan, so the bill grows every time you add a profile or onboard another brand, and the more capable analytics and team features are gated above the entry tier. For an agency or anyone juggling many accounts, that per-channel math adds up fast.
The open source alternatives below handle the same scheduling-and-queue workflow on infrastructure you run, where connecting another account or inviting another teammate doesn't change what you pay. Your drafts, calendar, and posting history live in a database you control, and the number of channels you manage is a question of your own resources rather than a pricing tier.
Postiz is an open-source social media scheduling tool for planning posts, managing accounts, and tracking performance in one place. It is built for teams and automation workflows that need scheduling, collaboration, and audience growth across social platforms.
listmonk is a standalone, self-hosted newsletter and mailing list manager for sending campaigns and transactional email. It stores its data in PostgreSQL and is packaged as a single binary.
BillionMail is an open-source mail server and email marketing platform for sending newsletters, promotional emails, and transactional messages. It is built for people who want to manage email campaigns with full control and avoid monthly fees.
Mixpost is a social media management platform for planning, scheduling, and publishing content from your own server. It is built for teams and businesses that want to manage social media operations in one place, hosted on infrastructure they control rather than a third-party service.
SendPortal is open-source, self-hosted email marketing and newsletter software. An organization can run its own email marketing application instead of a hosted-only service, with subscriber and list management, campaign sending, tracking, and reports in one web application.
phpList is open source email marketing software for creating, sending, integrating, and analyzing email campaigns and newsletters. It manages subscriber lists, campaign delivery, and reporting in one place.
