Open-source Sellsy alternatives

Dolibarr is an open-source ERP and CRM package for managing an organization's activity: contacts, suppliers, quotes, invoices, orders, stock, agenda, accounting, human resources, document management and manufacturing. It targets small, medium and large companies, foundations and freelancers.

It is a PHP web application with JavaScript enhancements, released under the GPL, version 3 or later, and can be used as a standalone application or as a web app reached over the internet or a LAN. Installation options include DoliWamp for Windows, DoliDeb for Debian and Ubuntu, DoliRpm for Red Hat family distributions, a Docker image, or a manual setup on Apache or Nginx with MariaDB, MySQL or PostgreSQL.

The project has a large community with free forums, and preferred partners offer commercial support if needed. Because it is modular, organizations switch on only the features they need. It suits small businesses and associations that want an integrated business suite they can host themselves.

SuiteCRM is an open-source customer relationship management application for businesses that want control over their data and the freedom to customize their CRM. Its module list covers accounts, contacts, leads, opportunities, quotes, contracts, cases, documents, reports and workflow automation, and it supports multiple languages and currencies.

The README separates two generations of the product. SuiteCRM 7 is described as a mature and stable line with a large community and regular releases of features, security patches and fixes, while SuiteCRM 8 is the newer version that was still catching up on features at the time of writing. The project also maintains an extensions directory, a demo, a community forum and a partner network. It is written in PHP.

SuiteCRM is licensed under AGPL-3.0 and is usually installed on your own web server with a database. Managed hosting and support are available through the vendor and partners. It suits small and mid-sized businesses and agencies that want an open-source alternative to commercial CRMs.

EspoCRM is a free, open-source customer relationship management platform that helps organizations store and manage leads, contacts, sales opportunities, marketing campaigns, and support cases in one web application. The project is released under the AGPL-3.0 license and has been developed since 2014.

The front end is a single-page application backed by a REST API written in PHP, which makes it easy to integrate with other systems. Its feature areas cover sales automation, email marketing, a calendar, kanban views, documents, a customer portal, and customer-support case handling. The data model can be customized to match different business processes.

EspoCRM runs on your own server with PHP 8.3 to 8.5 and MySQL 8, MariaDB 10.6 or later, or PostgreSQL 15 or later. An online demo is available for evaluation. It suits small and mid-sized organizations that want a configurable CRM they can host and modify themselves, and the vendor also sells paid extensions and hosting.

DaybydayCRM is a customer relationship management system built to help small teams keep track of everyday work. It brings clients, tasks, leads, appointments, invoices, payments and documents into one application, so staff can see a client's history without switching tools.

Features include task and lead management, invoice management, time registration, absence and vacation tracking, client and user appointments, role and permission management, global search, a client overview, and uploading and tracking of client files. The current stack is PHP 8.3 or newer with Laravel 12, MySQL or MariaDB, optional Redis queues, and a Blade and Vue front-end.

It is available as an open-source, self-hosted application with Docker and host-based installation guides in the project wiki, and as a hosted version at daybydaycrm.com. A public demo can be tried before installing. The repository metadata does not state a license, so check the repository for the exact terms.

NextCRM is an open-source customer relationship management system built with Next.js 16, React 19, TypeScript, PostgreSQL through Prisma and shadcn/ui. Beyond contact and sales tracking, it combines project management, invoicing, document storage, an email client, AI-powered features, vector search and an MCP server so AI agents can access its data.

A recent addition is a full invoicing module that supports invoices, credit notes, proforma invoices and receipts, with line items, configurable tax rates and VAT summaries, auto-numbered invoice series, multi-currency formatting, a status lifecycle from draft to paid or cancelled, recorded payments and balances, one-click duplication, an activity log, email delivery through Resend and server-side PDF export. Administrators manage tax rates, series and currencies in settings.

NextCRM is licensed under MIT and can be self-hosted. An online demo lets you sign in with a Google account or create a user, and the project maintains a roadmap, a Discord community and installation documentation for developers.

WP ERP is an open-source enterprise resource planning plugin for WordPress, developed by weDevs. It turns a WordPress site into a back-office system by bundling core modules for human resource management, customer relationship management and double-entry accounting.

A project management component is also included, and a long list of add-ons extends the plugin: custom field builder, employee recruitment, document manager, payroll, attendance management, payment gateway, HR frontend, WooCommerce integration, email campaign, deals, workflow, reimbursement, inventory, SMS notification, asset manager and Gravity Forms support, plus contact sync with Salesforce, HubSpot and Mailchimp. The documentation covers setup, and a WordPress Playground link lets you try it in the browser.

It requires PHP 5.6 and WordPress 4.4 or later, and building from source involves composer and npm steps. The repository metadata does not state a license, so check the plugin's terms, and note that it runs inside a WordPress installation you host yourself.