Open-source alternatives to Plunk

Mailtrain is a self-hosted newsletter platform and email marketing tool designed for managing subscriber lists and sending automated email campaigns from a private server. It provides a centralized system for coordinating the creation and delivery of recurring email outreach. The platform includes a visual email template builder for creating responsive layouts and a subscriber management system that uses custom fields to organize audiences into targeted segments. Automation is handled through tools that can trigger newsletters based on remote feeds and scheduled events. Performance is tracke

OpenChat is a conversational AI agent builder and customer service automation platform that uses large language models to power customer support chatbots across multiple channels. It provides tools for defining AI agent behavior, training on custom knowledge, managing actions, and controlling autopilot responses per channel. The platform enables deploying AI agents on web, phone, email, SMS, and WhatsApp, with a unified inbox for managing conversations across all channels. It includes CRM synchronization, automated workflows, contact segmentation, and analytics for tracking customer satisfact

Mail for Good is a bulk email marketing platform designed for managing subscriber databases, designing templates, and executing high-volume outreach campaigns. It functions as an email list management tool that facilitates contact data imports and the capture of new leads. The platform features an analytics dashboard for monitoring delivery metrics, tracking bounce rates, and measuring recipient engagement. It includes a role-based access control system to manage user permissions and secure the coordination of shared marketing accounts and campaigns. The system covers a broad range of capabi

WooCommerce is a comprehensive eCommerce framework for WordPress that transforms websites into fully functional online stores for physical and digital goods. It serves as a digital storefront manager for product catalogs, inventory, and customer orders across retail and wholesale business models. The system functions as a payment gateway integrator, connecting shops to diverse processors for credit cards, digital wallets, and subscriptions. It also operates as an order fulfillment system for calculating shipping rates, generating labels, and coordinating delivery via third-party couriers, whi

This project is an open-source, self-hosted helpdesk system designed to centralize customer support operations. It functions as an omnichannel platform that aggregates inquiries from email, social media, and messaging services into a unified dashboard, while providing a dedicated portal for customers to track requests and access self-service documentation. The system distinguishes itself through deep integration with e-commerce platforms, allowing agents to view customer order history and profile data directly within the ticketing interface. It features a modular architecture that supports cu

Listmonk is a self-hosted email marketing platform and newsletter manager designed for high-volume bulk email distribution and transactional messaging. It provides a centralized system for organizing large subscriber databases and executing automated marketing campaigns directly from your own infrastructure. The platform distinguishes itself through its reliance on a relational database backend, which enables dynamic subscriber segmentation using complex query filtering at the time of delivery. It utilizes a concurrent worker pool to manage high-throughput email dispatch and incorporates a se

This project is a modular, open-source customer relationship management platform built on the Laravel framework. It serves as a comprehensive business application framework designed for tracking sales pipelines, managing business entities, and automating marketing workflows. By providing a self-hosted solution, it enables organizations to maintain full control over their contact data, sales leads, and communication history. The platform distinguishes itself through a highly extensible architecture that allows developers to modify core behavior without altering the underlying source code. It u

Ever Gauzy is an integrated business management suite providing an ERP and CRM framework for professional services automation. It functions as a multi-tenant SaaS platform that combines time tracking, billing, and human resource management into a unified system. The project is distinguished by its headless architecture, utilizing a REST and GraphQL API gateway to expose business operations. It features a Model Context Protocol server that allows AI assistants to interact with system data and execute functional tools for automated business workflows. The platform covers a broad operational su

OpenStock is a stock market analysis platform designed for tracking real-time prices, analyzing market sentiment, and managing personalized financial watchlists. It serves as a financial portfolio tracker that allows users to monitor asset performance through technical indicators and candlestick charts. The platform distinguishes itself by aggregating sentiment data from social media, news sources, and prediction markets to visualize overall investor mood. It also features a specialized onboarding workflow that collects risk tolerance and financial objectives to tailor the tracking experience

NeoMutt is a terminal-based electronic mail management system that provides a text-based user interface for reading and composing emails. It functions as a mail manager and client supporting IMAP, POP3, and SMTP protocols, as well as NNTP for newsgroup access. The project distinguishes itself through integrated support for PGP and S/MIME encryption, providing tools for signing and encrypting messages and managing cryptographic keys. It supports modern authentication via OAuth2 and offers specialized MIME-aware reading capabilities for decoding multipart messages and visualizing MIME structure

This project is a visual HTML email builder and responsive design tool used to create mobile-ready email layouts. It includes a dynamic email template engine and an artificial intelligence generator for drafting email copy and structural layouts. The system utilizes a component-based layout engine to build emails using standardized blocks and columns, which are translated into table-based HTML for compatibility across diverse email clients. It supports personalization through variable-based template interpolation and conditional logic to adjust content based on specific data sets. The platfo

ToolsOfTheTrade is a comprehensive, curated directory designed to help developers and operational teams discover software services for a wide range of technical and business requirements. It functions as a centralized resource catalog, indexing tools that support the entire software development lifecycle, infrastructure management, and organizational productivity. The project distinguishes itself by providing a structured index of both hosted and self-hosted solutions, enabling users to identify specific utilities for tasks ranging from continuous integration and project planning to applicati

Chatwoot is a self-hosted, omnichannel customer support platform designed to aggregate messages from diverse social and digital channels into a single, collaborative team inbox. It provides organizations with full data ownership and control over their support infrastructure, ensuring strict logical separation of customer data through multi-tenant architecture. By centralizing communication, the platform enables teams to manage, route, and resolve inquiries within a unified workspace that maintains complete interaction history for every contact. The platform distinguishes itself through an eve

Mailspring is a cross-platform desktop email client designed to aggregate multiple accounts into a single, unified inbox. It utilizes standard protocols to synchronize messages and provides a centralized interface for managing professional correspondence across different email services. The application distinguishes itself through a suite of productivity tools that include automated message scheduling, follow-up reminders, and email engagement tracking to monitor recipient interactions. It also features contact enrichment to surface professional context and historical data, alongside built-in

Formbricks is an open-source survey and feedback platform designed to help teams capture and analyze user insights through targeted, in-app, and website-based interactions. It functions as a comprehensive customer experience analytics system that allows organizations to maintain full control over their data, user attributes, and survey workflows. The platform distinguishes itself through its event-driven architecture, which enables precise behavioral targeting by triggering surveys based on specific user actions or application events. It supports deep integration with external ecosystems by a

Stack Auth is an open-source authentication and authorization platform that provides pre-built UI components, OAuth integration, team management, and session handling for web applications. It offers a complete authentication lifecycle covering sign-in, sign-up, session management, password recovery, and multi-factor security, with support for passkey authentication and OAuth providers including Google, GitHub, and Apple. The platform includes a team-based permission system with role-based access control, allowing users to be organized into teams with granular permissions for membership manage

Square-ui is a component-based UI library and admin dashboard framework designed for building data-dense management interfaces. It provides a toolkit of reusable UI primitives and data visualization elements, such as kanban boards, heatmaps, and financial charts, to assemble internal tools and operational dashboards. The framework is distinguished by an event-driven UI architecture that utilizes a centralized event bus to synchronize real-time operational data across decoupled functional domains. It employs a constraint-based responsive grid system to organize widgets and manage data density

Twenty is a headless customer relationship management framework that enables developers to build, version, and deploy custom business applications using code. By utilizing a declarative approach to data modeling, the platform allows for the definition of custom objects, fields, and complex relationships directly within the source code. This schema-driven architecture automatically generates corresponding REST and GraphQL APIs, ensuring that data structures and interface components remain synchronized across development and production environments. The platform distinguishes itself through a m

Wasp is a declarative full-stack web framework that enables developers to build and deploy applications by defining their architecture in a centralized configuration. By using a high-level specification, the framework automates the orchestration of frontend, backend, and database components, ensuring that infrastructure concerns like routing, authentication, and data modeling are handled consistently across the entire stack. The framework distinguishes itself through its compiler-driven approach, which translates declarative configurations into cohesive, production-ready codebases. It provide

Next-saas-stripe-starter is a full-stack application template built for launching software-as-a-service products with user authentication, billing, and database integration. The platform combines a starter kit template with a type-safe database toolkit, object-relational mapping, and a payment processing integration for handling recurring customer billing, subscription tiers, and checkout workflows. User identity management is supported through social logins, secure sessions, and credential-based authentication. The core architecture supports type-safe database modeling, server-executed actio

Mailpit is an SMTP mail testing server and web-based email inbox designed to intercept and store outgoing emails for development and integration testing without delivering them to real recipients. It functions as an SMTP mocking tool and relay gateway, allowing users to capture mail traffic and view it through a browser interface. The project distinguishes itself by providing tools for SMTP server simulation, including the ability to inject failure codes to test application resilience. It also includes an email compatibility analyzer that validates HTML rendering, checks link integrity, and s

Keystone Classic is a Node.js headless content management system and web application framework. It provides a database schema framework for defining structured data models and validation rules to organize information. The system automatically generates a responsive administrative dashboard based on predefined data models and database fields, allowing for content management and record editing without custom administration code. The framework covers identity and security through session state management and password encryption. It includes capabilities for request routing, form submission proc

Quarkus is a Kubernetes-native Java framework designed for building high-performance, memory-efficient applications. It utilizes ahead-of-time native compilation to transform Java code into standalone, optimized binaries that eliminate the need for a virtual machine, enabling rapid startup and reduced memory consumption. By performing code augmentation during the build phase, it shifts heavy processing tasks away from runtime, ensuring that applications are optimized for cloud-native environments. The framework distinguishes itself through a unified approach to reactive and imperative program

OpenPanel is a self-hosted product analytics platform designed for tracking user behavior and visualizing product metrics on private infrastructure. It provides a comprehensive system for collecting events across web, mobile, and server environments while ensuring complete ownership of data. The platform distinguishes itself through a privacy-first approach, utilizing cookieless event tracking and regional data residency to simplify regulatory compliance. It integrates large language models via the Model Context Protocol, enabling users to query behavioral data and analyze trends using natura

Inbox Zero is an AI-powered email automation platform and inbox organizer. It uses large language models to automatically categorize, label, and archive emails, while providing a conversational interface for managing workflows and drafting responses through natural language. The project distinguishes itself by integrating real-time calendar availability into its drafting process and generating AI-summarized meeting briefings. It supports a pluggable AI provider interface with model fallback chains, allowing it to connect to various cloud or local LLM providers. Users can also control their in

This is a comprehensive marketing checklist and strategy guide specifically designed for startups and developer-focused B2B SaaS companies. It provides a structured, actionable framework covering the full spectrum of marketing activities, from foundational setup through advanced growth tactics, with a strong emphasis on content-driven demand generation. The guide distinguishes itself by focusing on the unique challenges of marketing technical products, offering detailed guidance on creating and scaling developer-focused content, including technical tutorials, comparison pieces, and persuasive

Zero is an email automation and link management platform designed for self-hosted infrastructure. It functions as an intelligent system that categorizes, prioritizes, and responds to incoming email communications using autonomous agents, while synchronizing message history into local storage for efficient data processing. The platform distinguishes itself by integrating enterprise identity providers to manage team access and permissions across shared resources. It also features a comprehensive link management toolset that generates branded URLs and personalized QR codes, supported by advanced