Open-source alternatives to Crater

Invoice Ninja is a professional billing and invoicing platform designed for managing clients, projects, and financial records. It serves as a multi-currency billing system and time tracker available as both a cloud-based application and a self-hosted suite. The platform distinguishes itself through comprehensive support for regional taxes, diverse currency formats, and automated exchange rate updates. It includes dedicated cross-platform mobile and desktop applications to manage business data across different operating systems. The software covers the end-to-end financial lifecycle, includin

Lago is an open-source billing platform designed for managing subscriptions, usage-based metering, and automated invoicing. It functions as a comprehensive system for defining pricing plans, tracking real-time consumption via a metering engine, and controlling feature entitlements based on active customer subscriptions. The platform differentiates itself through a dynamic billing engine that supports hybrid pricing models and a credit-based wallet system for managing prepaid funds. It includes specialized tools for multi-tenant entitlement mapping, allowing operators to tie specific product p

Crater is an open-source invoicing and expense tracking software designed for individuals and small businesses. It serves as a self-hosted billing platform that allows users to monitor the overall financial health of a business by recording professional services rendered and tracking outgoing costs. The system functions as a payment gateway integrator, connecting to third-party providers such as Stripe to process secure transactions for issued invoices. It provides specialized tools for freelance invoice management, including the generation of professional billing documents and cost estimates

Big Capital is a cloud accounting management system designed to track assets, liabilities, and equity through a digital ledger. It provides a multi-tenant organizational framework that supports multi-branch tracking and regional currency settings. The system distinguishes itself through integrated bank feed management, utilizing secure token exchanges and webhook processing for automated transaction synchronization and rule-based categorization. It also features a multi-currency ledger that handles base currency conversions and specific currency codes. The platform covers comprehensive finan

Polar is a digital product monetization engine and subscription management system. It serves as a merchant of record platform that handles global sales tax and VAT compliance, providing the infrastructure for selling subscriptions and one-time digital goods via hosted checkouts and embedded payment flows. The project functions as an entitlement and access manager, automating the granting and restriction of digital benefits, license keys, and third-party platform roles. It includes a dedicated usage-based billing infrastructure that tracks customer activity through meters to apply aggregation

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

CRMEB is a comprehensive e-commerce platform built on ThinkPHP 6, designed as a headless system that delivers standardized APIs to various frontend clients. It provides a unified backend to synchronize product catalogs, orders, and customer data across web browsers, mobile applications, and mini-programs. The platform supports diverse commerce models, including multi-vendor marketplaces where independent merchants manage their own stores, centralized chain store networks, and social commerce frameworks featuring affiliate distribution and community group buying. It also integrates specialized

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

TastyIgniter is a comprehensive restaurant management system and digital ordering engine. Built as a modular application framework, it provides the tools necessary to operate online food ordering, table reservation systems, and multi-vendor e-commerce platforms. The platform is designed to handle complex restaurant operations, including multi-location networking and multi-vendor marketplace management. It distinguishes itself through specialized restaurant automation, such as coordinating guest limits and time slots for bookings, managing ingredient and allergen catalogs, and implementing mul

Idurar is an integrated system combining Customer Relationship Management and Enterprise Resource Planning. It functions as a headless business API that generates secure REST endpoints and administrative panels from configuration files to connect business logic with external applications. The platform supports multi-tenant SaaS management, isolating data and configurations for multiple companies or branches within a single installation. It is designed for international business accounting, featuring a multi-currency financial engine that processes transactions and manages regional tax rules a

The stripe-php library is a PHP client used to integrate Stripe payment processing, subscription billing, and financial services into applications. It provides a programmatic interface for managing connected accounts, issuing virtual cards, and automating payouts to sellers. The library distinguishes itself through a comprehensive suite of billing and payment tools, including support for recurring charges, usage-based billing, and the management of customer self-service portals. It further enables financial automation via tax and revenue libraries that handle global sales tax calculation and

BTCPay Server is a non-custodial payment gateway and invoice manager designed for accepting Bitcoin and other cryptocurrencies directly into a private wallet. It serves as a self-hosted payment infrastructure that allows merchants to manage digital invoicing and storefronts without relying on third-party intermediaries. The system distinguishes itself through a non-custodial wallet architecture that ensures private keys remain on the user's own hardware or server. It integrates the Lightning Network for instant, low-cost transactions and provides a hardware-wallet signing bridge to secure tra

Dolibarr is an open-source business suite and integrated PHP web application designed for ERP and CRM management. It serves as a centralized system for tracking company activities, including sales, invoicing, stock, and accounting. The platform combines financial accounting, human resources management, and web-based inventory tracking. It provides tools for managing general ledgers, bank accounts, employee timesheets, and product catalogs alongside manufacturing orders and warehouse stock levels. The software covers a broad range of operational areas, including customer relationship manageme

Solidtime is time tracking software designed for freelancers and agencies to record work durations, manage billable hours, and monitor labor allocation. It serves as a professional services automation tool that organizes work into clients and projects while managing team member assignments. The system features a billable rate manager that defines hourly costs at the organizational, member, and project levels using hierarchical overrides to calculate total billing. It includes a project management tool for organizing clients and tasks into hierarchies with role-based access permissions. The p

Firefly III is a self-hosted personal finance management system built on a double-entry bookkeeping engine. It provides a comprehensive platform for tracking income, expenses, and account balances while maintaining financial integrity through structured accounting principles. Designed for private use, the system supports multi-user access, allowing independent financial administrations to coexist within a single installation. The platform distinguishes itself through extensive automation and integration capabilities. It features a robust REST JSON API and webhook system that enables programma

SimplCommerce is a .NET e-commerce platform and cross-platform commerce system designed for comprehensive store management. It operates as a modulithic store engine that organizes business logic into distinct modules to handle product catalogs, payments, and shipping. The system functions as a digital payment orchestrator and retail inventory manager. It integrates payment gateways to secure online sales and maintains accurate records of stock levels to prevent the overselling of goods. The platform covers a broad capability surface including shipping logistics automation for calculating del

Simple and elegant invoicing solution.

Eladmin is a backend management system and administrative framework built with Spring Boot and Vue. It provides a complete infrastructure for creating administration panels, combining a Java Persistence API backend scaffold with a management interface to monitor system performance and log user activities. The project features automated code generation to produce frontend and backend source code and CRUD operations. It employs a role-based access control system to manage users and organizational structures, while utilizing dynamic route management to update navigation menus from the backend wi

Beego is a high-performance toolkit for building web applications and RESTful APIs using the Go programming language. It is structured as an MVC web framework that separates data models, views, and controllers to organize application logic. The project provides a comprehensive suite of integrated tools, including an object-relational mapper for translating code objects into database tables and a session manager for maintaining user identity and state across server requests. It also includes an internationalization framework for managing multilingual content and translating text based on user

Ghostfolio is a self-hosted portfolio tracker designed for personal finance tracking and wealth management. It allows users to record investment transactions and monitor asset holdings across multiple financial accounts in a single private environment. The system provides a financial performance analyzer to calculate investment returns and generate growth charts. It includes an investment risk auditor that performs static analysis on asset holdings to identify financial vulnerabilities and diversification gaps. The platform covers broader capabilities for multi-account management and financi

This project serves as a comprehensive educational repository and technical reference collection, documenting a wide range of software engineering practices and modern development technologies. It provides a structured learning path for developers, curating tutorials and practical examples that cover the full lifecycle of application development, from initial project scaffolding to deployment and maintenance. The repository distinguishes itself by offering deep technical insights into complex architectural patterns, including actor-based concurrency models for managing parallel tasks and cont

Invoify is a browser-based billing tool and invoice generator built with Next.js and TypeScript. It provides a web interface for designing, creating, and managing professional billing documents for clients. The application features a professional invoice designer with live previews and layout templates. It allows for the direct generation of portable document format files and includes an integrated email service for automated invoice delivery to recipients. The system manages billing data through local browser storage and supports exporting invoice information into PDF, JSON, and CSV formats

This project is a multi-vendor marketplace platform designed for food, grocery, and courier delivery services. It provides a comprehensive system for managing the entire lifecycle of a delivery request, including customer ordering, vendor menu management, and logistics coordination between customers, vendors, and delivery agents. The platform distinguishes itself through a cross-platform architecture that bridges web-based application code into native mobile environments for deployment on standard app stores. It utilizes real-time socket communication to synchronize location updates and order

yii2_fecshop is a comprehensive B2C e-commerce platform and CMS built on the Yii2 PHP framework. It functions as a headless commerce API and an international storefront solution, supporting both single-vendor stores and multi-vendor marketplaces where independent merchants can manage their own products and orders. The system is distinguished by a multi-entry point architecture that separates administrative, web, mobile, and API interfaces while sharing a common service layer. It provides high extensibility through configuration-driven service replacement, event-driven functional extensions, a

This project is a software-as-a-service application boilerplate and foundation designed to provide the core business infrastructure for building software services. It functions as a multi-tenant user management system that handles account creation, user authentication, and organizational team structures across multiple customer accounts. The kit integrates enterprise identity features, including a service for automating user and group management via the System for Cross-domain Identity Management standard. It also includes a billing implementation for managing recurring payments, one-time tra

This project is a modular e-commerce platform built on Ruby on Rails, designed to serve as a comprehensive engine for managing online retail operations. It provides the foundational infrastructure to handle complex product catalogs, customer order lifecycles, and global payment processing within a unified system. The platform distinguishes itself through a headless, API-first architecture that decouples backend commerce logic from custom frontend storefronts. It supports multi-tenant environments, allowing for the management of multiple independent retail storefronts or marketplaces from a si

GnuCash is a double-entry accounting software designed for personal and small-business financial management. It tracks assets, liabilities, income, and expenses using a bookkeeping system that ensures financial accuracy. The platform functions as a multi-currency bookkeeping system and a SQL-based financial ledger, persisting accounting data in relational databases or XML files. The system is distinguished by its extensibility as a Python-scriptable accounting tool, providing Python bindings and a REPL for automating tasks and creating custom reports. It also serves as an investment portfolio