Open Source Marketing & Customer Engagement Tools using CSS

A curated collection of the best free and open source tools for reaching an audience, covering newsletters, social scheduling, notifications, link tracking and campaign analytics using CSS.

Postiz

Self-hostable social media scheduling tool with analytics, team collaboration and an API, covering platforms like X, Bluesky, Mastodon and Discord.

Alternative to:

Buffer

Schedule, analyze, and manage 30+ social media accounts

Stars
39,560
Forks
7,529
Last commit
4 days ago

Chatwoot

Self-hosted support desk that unifies live chat, email and social messaging in one inbox, with an AI agent and help center.

Alternative to:

Zendesk

Omnichannel customer support with a built-in AI assistant

Stars
38,455

Listmonk

A self-hosted newsletter and mailing list manager that ships as one binary and stores everything in PostgreSQL.

Alternative to:

Mailchimp

Self-hosted newsletter and mailing list manager

Stars
24,011

Krayin

A Laravel and Vue CRM framework for small businesses and enterprises that want to own and extend customer lifecycle management.

Alternative to:

HubSpot

Self-hosted CRM for enhanced business relationships

Stars
24,071

Billion Mail

Self-hosted mail server and email marketing platform for businesses that want to send newsletters and campaigns without a third-party provider.

Alternative to:

Mailgun

Open-source mail server with unlimited sending & AI tools

Stars
15,961

Sink

A link shortener with analytics running entirely on Cloudflare, for individuals and small teams who want to host their own.

Alternative to:

Bitly

Simple, speedy, and secure link shortener with analytics

Stars
7,242

Mautic

Open source marketing automation for organizations that want to run campaigns on their own infrastructure and keep the contact data.

Alternative to:

HubSpot

Open source marketing automation for everyone

Stars
10,856

Fonoster

A programmable telecommunications stack for developers who want voice applications and PBX features running on infrastructure they control themselves.

Alternative to:

Twilio

Open-source cloud communications platform for developers

Stars
8,152

useSend

Open-source email sending platform built on Amazon SES, covering transactional mail, marketing campaigns, contacts and delivery analytics from a single dashboard.

Alternative to:

Mailgun

Pay per email sent, not for contact storage

Stars
4,762

Erxes

Source-available experience operating system that unifies marketing, sales, operations and support in one self-hosted, plugin-based platform for growing businesses.

Alternative to:

HubSpot

Open-source growth platform for customer-centric teams

Stars
4,100

Frappe Helpdesk

Open-source ticket management tool with separate agent and customer portals, SLA tracking and a knowledge base, built on the Frappe framework.

Alternative to:

Zendesk

Open-source ticketing system for streamlined support

Stars
3,451

LinkStack

Self-hosted link sharing platform where several users each build a customizable page of links, all managed from a shared admin panel.

Alternative to:

Linktree

Your digital identity, beautifully organized

Stars
3,926

Mixpost

A self-hosted social media scheduler for agencies, small businesses and creators who want publishing and analytics without per-seat pricing.

Alternative to:

Buffer

Self-hosted social media management without limits

Stars
3,876

LittleLink

DIY link-in-bio page you host yourself, built from plain HTML and CSS with more than a hundred branded button styles.

Alternative to:

Linktree

Create your own link-in-bio page with 100+ branded buttons

Stars
3,114

Dittofeed

Omni-channel customer engagement platform for developers who want automated user journeys, broadcasts and message templates they can self-host.

Alternative to:

Segment

Open-source customer engagement platform for automation

Stars
3,026

Chaskiq

A messaging platform for marketing, support and sales teams, combining live chat, campaigns, bots and a help center.

Alternative to:

Zendesk

Open-source customer communication platform

Stars
3,579

Usertour

Open-source user onboarding platform for building in-app product tours, checklists, launchers and surveys, self-hosted with full control.

Alternative to:

Appcues

Create engaging product tours and user onboarding experiences

Stars
2,328

Notifuse

Self-hosted email platform for newsletters, transactional sending and automations, built for teams that want off per email pricing.

Alternative to:

Mailchimp

Self-hosted email platform with visual editor & analytics

Stars
2,265

Sendune

Sendune Email Designer is a drag and drop HTML email builder for teams who want templates that work with any sending provider.

Alternative to:

Beefree

Simplify AWS SES email management with ease

Stars
2,304

TryPost

A self-hosted social media scheduler that publishes natively to twelve networks from one calendar, with an AI copilot and MCP server.

Alternative to:

Buffer

Schedule posts to every major social network, self-hosted

Stars
758

Linky

Link-in-bio page builder whose blocks pull live content from Spotify, Instagram, TikTok and GitHub, for creators tired of stale pages.

Alternative to:

Linktree

A delightfully rich and dynamic link-in-bio.

Stars
798

Cossistant

Open source chat support widget for React, giving developers headless components, real-time messaging and the backend infrastructure behind them.

Alternative to:

Zendesk

AI-native support infrastructure for modern SaaS

Stars
737

Contentport

Content tool that drafts and schedules tweets in your own writing style, aimed at founders and content managers posting daily.

Alternative to:

Buffer

Your content engine for growing on Twitter at scale

Stars
772

Wraps

A code-first email platform that deploys sending infrastructure into your own AWS account, aimed at TypeScript developers who want to own the pipes.

Alternative to:

Mailgun

Code-first email platform that deploys to your AWS

Stars
66

Slugy

A link shortener with custom domains, QR codes and click analytics, for teams sharing branded links from a single dashboard.

Alternative to:

Bitly

Transform long URLs into beautiful, trackable short links

Stars
95

Hyvor Post

A newsletter platform with no open or click tracking, for writers who would rather not surveil the people reading them.

Alternative to:

Mailchimp

Privacy-first newsletter platform without tracking

Stars
34

Tiledesk

An open source live chat and chatbot platform for building customer support across web, WhatsApp, Messenger and Telegram from one script.

Alternative to:

Voiceflow

No-code platform to build AI agents and automate support

Stars
15

Brace.to

A bookmark manager with end-to-end encryption on Stacks, for people who want their saved links private across web, Android and iOS.

Alternative to:

Raindrop.io

Securely save and access your favorite links across devices

Stars
107

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Stars
Forks
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Stars
Forks
Last commit

Stars
Forks
Last commit

Open Source Marketing & Customer Engagement Tools using CSS

A curated collection of the best free and open source tools for reaching an audience, covering newsletters, social scheduling, notifications, link tracking and campaign analytics using CSS.

Postiz

Chatwoot

Listmonk

Krayin

Billion Mail

Sink

Mautic

Fonoster

useSend

Erxes

Frappe Helpdesk

LinkStack

Mixpost

LittleLink

Dittofeed

Chaskiq

Usertour

Notifuse

Sendune

TryPost

Linky

Cossistant

Contentport

Wraps

Slugy

Hyvor Post

Tiledesk

Brace.to

Postiz

Chatwoot

Listmonk

Krayin

Billion Mail

Sink

Mautic

Fonoster

useSend

Erxes

Frappe Helpdesk

LinkStack

Mixpost

LittleLink

Dittofeed

Chaskiq

Usertour

Notifuse

Sendune

TryPost

Linky

Cossistant

Contentport

Wraps

Slugy

Hyvor Post

Tiledesk

Brace.to

Novu