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Open Source Business Software

A curated collection of the best open source software that runs a business day to day, covering CRM and sales, finance and accounting, HR, legal, project management, e-commerce, and customer support.

See also:CRM & SalesERP & OperationsHuman Resources (HR)Marketing & Customer EngagementCustomer Support & SuccessE-commerce PlatformsCollaboration & CommunicationScheduling & Event ManagementDocument Management & E-SignaturesForms & SurveysCompliance & Risk ManagementLegalFinance & AccountingProject & Work Management
Favicon of Docs

Docs

Create, edit and share documents with real-time collaboration

  • Stars

    16,734

  • Last commit

    2 days ago

  • License

    MIT
Transform document collaboration with real-time editing, version control, and secure sharing features that enhance team productivity and communication.

Open Source Alternative to:

Favicon of Notion
Notion
Favicon of Billion Mail

Billion Mail

AI
Open-source mail server with unlimited sending & AI tools

  • Stars

    15,426

  • Last commit

    2 months ago

  • License

    AGPL-3.0
Self-hosted email marketing platform with unlimited sending, AI-powered email creation, real-time analytics, and no monthly fees. Complete SMTP solution.

Open Source Alternative to:

Favicon of Resend
Resend
Favicon of Documenso

Documenso

Secure, open-source document signing for everyone

  • Stars

    14,615

  • Last commit

    9 hours ago

  • License

    AGPL-3.0
Streamline your document workflows with a powerful, privacy-focused e-signature platform that puts you in control of your data.

Open Source Alternative to:

Favicon of DocuSign
DocuSign
Favicon of Spree Commerce

Spree Commerce

Open source headless commerce with REST API, no platform fees, built for B2B and marketplaces

  • Stars

    15,631

  • Last commit

    9 hours ago

  • License

    BSD-3-Clause
Headless eCommerce platform with REST API, TypeScript SDK, and Next.js storefront. Handle B2B, multi-vendor marketplaces, and cross-border commerce. Self-hosted, open source, zero fees.

Open Source Alternative to:

Favicon of Shopify
Shopify
Favicon of Midday

Midday

Streamline your business finances and operations

  • Stars

    14,775

  • Last commit

    2 months ago

  • License

    AGPL-3.0
All-in-one tool for freelancers and small businesses to manage finances, track time, store files, and send invoices efficiently.

Open Source Alternative to:

Favicon of YNAB
YNAB
Favicon of WooCommerce

WooCommerce

Open-source ecommerce platform for WordPress

  • Stars

    10,462

  • Last commit

    8 hours ago

  • License

    GPL-2.0
Build and manage online stores with customizable features, extensions, and themes for businesses of all sizes.

Open Source Alternative to:

Favicon of Shopify
Shopify
Favicon of Formbricks

Formbricks

Privacy-first survey and experience management platform

  • Stars

    12,794

  • Last commit

    8 hours ago

  • License

    AGPL-3.0
Collect feedback across websites, apps, and emails with targeted surveys, user segmentation, and GDPR-compliant data handling. Self-host or use the cloud.

Open Source Alternative to:

Favicon of Google Forms
Google Forms
Favicon of OpenProject

OpenProject

Classic, agile, or hybrid project management, self-hosted

  • Stars

    15,889

  • Last commit

    9 hours ago

  • License

    GPL-3.0
Full-featured project management platform with Gantt charts, agile boards, time tracking, and team collaboration. Self-host or use managed cloud hosting.

Open Source Alternative to:

Favicon of Linear
Linear
Favicon of Fluxer

Fluxer

Open source messaging with privacy and community focus

  • Stars

    10,035

  • Last commit

    8 hours ago

  • License

    AGPL-3.0
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open Source Alternative to:

Favicon of Discord
Discord
Favicon of Gumroad

Gumroad

Your all-in-one marketplace for digital creators and products

  • Stars

    9,597

  • Last commit

    9 hours ago

  • License

    MIT
A digital marketplace platform where creators can sell digital products, from courses to software, with built-in payment processing and content delivery.

Open Source Alternative to:

Favicon of Stripe
Stripe
Favicon of Seafile

Seafile

Self-hosted file sync with AI-powered organization

  • Stars

    15,146

  • Last commit

    12 days ago

  • License

    Unknown
Open source file sync and sharing platform with custom properties, AI automation, collaborative editing, and enterprise-grade security for teams.

Open Source Alternative to:

Favicon of Google Drive
Google Drive
Favicon of Sink

Sink

Simple, speedy, and secure link shortener with analytics

  • Stars

    7,030

  • Last commit

    11 days ago

  • License

    AGPL-3.0
A serverless link shortener that runs entirely on Cloudflare, offering URL compression, analytics, and customizable slugs.

Open Source Alternative to:

Favicon of TinyURL
TinyURL
Favicon of Element

Element

Secure, decentralized messaging for teams and individuals

  • Stars

    13,388

  • Last commit

    8 hours ago

  • License

    AGPL-3.0
Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Open Source Alternative to:

Favicon of Discord
Discord
Favicon of Planka

Planka

Self-hosted Kanban board with real-time collaboration

  • Stars

    12,420

  • Last commit

    9 days ago

  • License

    Unknown
Self-hosted Kanban board for agile teams. Unlimited boards, real-time sync, GDPR-compliant, and available as a free Community Edition or paid Pro.

Open Source Alternative to:

Favicon of Jira
Jira
Favicon of UnoPim

UnoPim

AI-powered PIM for managing product catalogs at scale

  • Stars

    10,849

  • Last commit

    1 day ago

  • License

    MIT
Open source Product Information Management system with an AI agent for catalog enrichment, bulk updates, multilingual content, and omnichannel distribution.

Open Source Alternative to:

Favicon of Akeneo
Akeneo
Favicon of Akaunting

Akaunting

Free online accounting for small businesses and freelancers

  • Stars

    10,071

  • Last commit

    1 day ago

  • License

    Unknown
Self-hostable accounting software covering invoicing, expense tracking, cash flow, and client portals. Free to use, available in 50+ languages.

Open Source Alternative to:

Favicon of Quickbooks
Quickbooks
Favicon of Polar

Polar

Modern payment infrastructure for digital products and SaaS

  • Stars

    10,202

  • Last commit

    8 hours ago

  • License

    Apache-2.0
Comprehensive payment solution with built-in tax handling, automated benefits, and seamless integrations for digital product and SaaS businesses.

Open Source Alternative to:

Favicon of Stripe
Stripe
Favicon of Mautic

Mautic

Open source marketing automation for everyone

  • Stars

    10,370

  • Last commit

    13 hours ago

  • License

    Unknown
Mautic is a free and open source marketing automation platform that helps businesses manage leads, create campaigns, and analyze results.

Open Source Alternative to:

Favicon of Mailchimp
Mailchimp
Favicon of Papermark

Papermark

Open-source document sharing with powerful analytics

  • Stars

    8,954

  • Last commit

    1 day ago

  • License

    AGPL-3.0
Secure, customizable platform for sharing documents and tracking engagement. Perfect for sales teams, marketers, and businesses.

Open Source Alternative to:

Favicon of PandaDoc
PandaDoc
Favicon of Kaneo

Kaneo

Simple, secure project management for development teams

  • Stars

    8,379

  • Last commit

    8 hours ago

  • License

    MIT
Self-hosted project management platform with visual task management, data privacy, and complete control over customization - built by developers for developers.

Open Source Alternative to:

Favicon of Linear
Linear
Favicon of Kutt

Kutt

Simplify your links with this free, modern URL shortener

  • Stars

    11,039

  • Last commit

    3 days ago

  • License

    MIT
Kutt offers a free and open-source solution for shortening URLs, complete with custom domains and detailed analytics.

Open Source Alternative to:

Favicon of TinyURL
TinyURL
Favicon of Lago

Lago

Transform complex usage data into accurate, real-time billing

  • Stars

    10,369

  • Last commit

    1 day ago

  • License

    AGPL-3.0
Open-source billing system that handles metering, usage-based pricing, and invoicing at scale. Perfect for AI, cloud, and API companies needing flexible monetization.

Open Source Alternative to:

Favicon of Stripe Billing
Stripe Billing
Favicon of Leantime

Leantime

Goal-driven project management for all brains

  • Stars

    11,393

  • Last commit

    5 days ago

  • License

    AGPL-3.0
Open-source software designed to streamline tasks, boost productivity, and enhance collaboration for teams of all types, including those with ADHD and neurodiversity.

Open Source Alternative to:

Favicon of Jira
Jira
Favicon of HeyForm

HeyForm

Create powerful forms with ease and flexibility

  • Stars

    8,940

  • Last commit

    23 hours ago

  • License

    AGPL-3.0
A versatile form builder for crafting custom surveys, quizzes, and data collection tools with advanced features and integrations.

Open Source Alternative to:

Favicon of Google Forms
Google Forms
Favicon of Invoice Ninja

Invoice Ninja

Send invoices, accept payments, manage your business—all free

  • Stars

    10,008

  • Last commit

    3 days ago

  • License

    Elastic-2.0
Free invoicing software for freelancers and small businesses. Create professional invoices, track expenses, accept online payments, and manage projects without hidden fees.

Open Source Alternative to:

Favicon of Quickbooks
Quickbooks
Favicon of Alokai

Alokai

Build and deploy scalable storefronts with ease

  • Stars

    10,942

  • Last commit

    2 months ago

  • License

    MIT
A comprehensive Frontend as a Service solution that helps developers create, deploy and manage enterprise ecommerce storefronts with ready integrations and cloud infrastructure.

Open Source Alternative to:

Favicon of Shopify
Shopify
Favicon of Fizzy

Fizzy

Modern kanban that's fast, fun, and refreshingly simple

  • Stars

    8,092

  • Last commit

    9 hours ago

  • License

    Unknown
Track issues, ideas, and projects with a modern kanban board that's fast and straightforward. Free for 1000 cards, then $20/month for unlimited use.

Open Source Alternative to:

Favicon of Jira
Jira
Favicon of Vendure

Vendure

Flexible e-commerce for modern businesses

  • Stars

    8,351

  • Last commit

    11 hours ago

  • License

    MIT
A headless, API-first e-commerce framework built on Node.js with TypeScript, offering customization and scalability for online stores.

Open Source Alternative to:

Favicon of WooCommerce
WooCommerce
Favicon of OpenSign

OpenSign

Secure, customizable e-signatures for modern businesses

  • Stars

    6,878

  • Last commit

    16 hours ago

  • License

    AGPL-3.0
A powerful, open-source e-signature solution offering customization, integration, and enhanced security for businesses of all sizes.

Open Source Alternative to:

Favicon of DocuSign
DocuSign
Favicon of Expensify

Expensify

Simplify expense management for businesses of all sizes

  • Stars

    5,008

  • Last commit

    8 hours ago

  • License

    MIT
Automate expense reporting, reimbursements, and corporate card management with real-time data sync and powerful integrations.
Favicon of Fonoster

Fonoster

Open-source cloud communications platform for developers

  • Stars

    8,079

  • Last commit

    1 day ago

  • License

    MIT
Build and deploy powerful voice and messaging applications with ease using Fonoster's flexible, scalable, and developer-friendly platform.

Open Source Alternative to:

Favicon of Twilio
Twilio
Favicon of Your Next Store (YNS)

Your Next Store (YNS)

Launch Your Store in Minutes, No Code Needed

  • Stars

    5,478

  • Last commit

    6 days ago

  • License

    MIT
Fast, modern e-commerce with instant setup and full customization. Powered by Stripe for seamless transactions.

Open Source Alternative to:

Favicon of Shopify
Shopify
Favicon of Mike

Mike

AI
Open-source legal AI that law firms control and extend

  • Stars

    4,135

  • Last commit

    15 hours ago

  • License

    AGPL-3.0
Self-hostable alternative to Harvey and Legora with document analysis, contract drafting, tabular review, and reusable workflows. Zero licensing costs, full data control.

Open Source Alternative to:

Favicon of Harvey
Harvey
Favicon of Crater

Crater

AI-powered embedded AR/AP automation for platforms

  • Stars

    8,341

  • Last commit

    2 years ago

  • License

    AGPL-3.0
Crater offers AI-driven invoicing workflows, payments, and working capital tools to enhance your platform with minimal technical effort.

Open Source Alternative to:

Favicon of Quickbooks
Quickbooks
Favicon of Workadventure

Workadventure

Virtual office platform for engaging remote collaboration

  • Stars

    5,722

  • Last commit

    9 hours ago

  • License

    Unknown
Create customizable virtual workspaces for remote teams to interact naturally, host events, and collaborate through spontaneous conversations and scheduled meetings.

Open Source Alternative to:

Favicon of Microsoft Teams
Microsoft Teams
Favicon of Papra

Papra

Organize and secure your documents in one central hub

  • Stars

    5,217

  • Last commit

    9 hours ago

  • License

    AGPL-3.0
A document management platform that helps you archive, organize, and search files with email ingestion, tagging capabilities, and powerful search functionality.

Open Source Alternative to:

Favicon of Google Drive
Google Drive
Favicon of Kan

Kan

Open source kanban boards with unlimited everything

  • Stars

    5,359

  • Last commit

    7 days ago

  • License

    AGPL-3.0
Free kanban project management with unlimited boards, lists, and cards. Import Trello boards, collaborate with teams, and self-host for complete control.

Open Source Alternative to:

Favicon of Jira
Jira
Favicon of Plunk

Plunk

The open-source, affordable email platform

  • Stars

    5,376

  • Last commit

    2 days ago

  • License

    AGPL-3.0
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.

Open Source Alternative to:

Favicon of Resend
Resend
Favicon of Campfire

Campfire

Self-hosted group chat without recurring subscription fees

  • Stars

    4,494

  • Last commit

    9 hours ago

  • License

    MIT
Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.

Open Source Alternative to:

Favicon of Slack
Slack
Favicon of Flexprice

Flexprice

Open source metering and billing infrastructure for any pricing model

  • Stars

    4,358

  • Last commit

    9 hours ago

  • License

    AGPL-3.0
A flexible billing platform that handles usage-based metering, credit management, and subscription billing, giving developers full control over pricing models.

Open Source Alternative to:

Favicon of Stripe Billing
Stripe Billing
Favicon of ezBookkeeping

ezBookkeeping

Lightweight self-hosted bookkeeping with AI receipt scanning

  • Stars

    5,427

  • Last commit

    10 hours ago

  • License

    MIT
A privacy-first personal finance app with two-level accounts, multi-currency support, AI receipt recognition, and broad data import from formats like GnuCash and Firefly III.

Open Source Alternative to:

Favicon of YNAB
YNAB
Favicon of Solidus

Solidus

Flexible eCommerce platform for brands that stand out

  • Stars

    5,319

  • Last commit

    8 hours ago

  • License

    Unknown
Open-source eCommerce platform offering customization, scalability and enterprise-grade features for brands of all sizes

Open Source Alternative to:

Favicon of Shopify
Shopify
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