Open-source alternatives to Xpay

This software is a web-based management platform designed for religious and nonprofit organizations to track member records, financial contributions, and event participation. It functions as a centralized system for maintaining detailed profiles for individuals and families, organizing members into groups, and monitoring engagement through attendance tracking. The platform distinguishes itself by integrating geospatial mapping tools that visualize member distribution to assist with community outreach and logistics planning. It also includes specialized financial modules for processing donatio

Jeepay is an open-source payment gateway that accepts payments through WeChat Pay, Alipay, and UnionPay from a single integrated system. It functions as a multi-channel payment platform with aggregated QR code generation, allowing customers to scan one code and pay with any supported method, while also providing multi-merchant account management for onboarding and isolating independent merchants with their own payment configurations. The system secures all API requests and responses using cryptographic signatures to verify authenticity and prevent tampering. It delivers asynchronous payment r

This project is a Next.js SaaS starter kit and billing boilerplate designed for building subscription-based software services. It provides a pre-configured foundation that integrates a PostgreSQL database schema with Stripe to manage recurring billing, tiered pricing models, and customer payment portals. The implementation features a synchronization system that uses webhooks to mirror external product data and subscription states into a local relational database. It includes an authentication layer that links external identity providers to user accounts and manages secure session tracking. T

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

The Wikipedia iOS app is a native client for reading, editing, and contributing to Wikipedia articles on iPhone and iPad. It provides a bridge-based rendering system that serializes view updates over JSON to native iOS components for fast scrolling, along with a native wikitext editor featuring real-time syntax highlighting and formatting tools for editing article content. The app includes a feature flag system with compile-time and runtime flags for enabling experimental capabilities through a hidden settings panel, and a file-based localization system that loads language-specific resource fi

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

This project provides a visual credit card form UI component and payment input visualizer. It creates an interactive checkout interface that displays a dynamic visual representation of a credit card, updating in real time as users enter payment details into a form. The interface includes localized payment capabilities, allowing the replacement of default labels and validation messages with custom strings to support multiple languages. Users can customize visual fields and input placeholders to control the default text and symbols displayed during the checkout process. The system manages real

Hyperswitch is a payment orchestration platform designed to manage complex transaction lifecycles through a centralized control layer. It functions as a processor-agnostic integration hub that standardizes disparate external payment APIs, allowing businesses to route transactions across multiple providers to optimize for authorization rates and cost efficiency. The platform utilizes a state-machine-based architecture to track every payment from initial authentication to final settlement, ensuring consistent processing and reliable error recovery. What distinguishes the platform is its intelli

Blowfish is a responsive theme for the Hugo static site generator, designed for creating content-focused websites. It utilizes the Tailwind CSS UI framework for utility-first styling and a Go-based engine to transform templates into plain HTML. The project features a technical content renderer that transforms LaTeX and Mermaid syntax into mathematical equations and SVG diagrams. It includes a serverless search system that generates a JSON index at build time for client-side retrieval and a multilingual publishing framework with support for right-to-left scripts. The theme covers a broad rang

This project is a comprehensive software entrepreneurship curriculum and solopreneurship business playbook designed for developers. It provides a strategic framework for building, validating, and monetizing side businesses using lean startup methodology and a systematic product development approach. The project distinguishes itself by offering specific guides for digital monetization and career anti-fragility, helping software engineers transition from employment to self-employment. It focuses on turning technical skills into scalable digital assets, paid communities, and independent software

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

Cnblogs-Theme-SimpleMemory is a customizable visual template for Cnblogs that modifies the layout and styling of blog posts and profile pages. It provides a combination of CSS stylesheets and a JavaScript-driven user interface to alter colors, typography, and layout elements. The theme includes dynamic interface enhancements such as a light and dark mode switcher, a scroll-based reading progress indicator, and a customizable embedded music player. It supports automated visual modifications triggered on specific remembrance days and the ability to change browser tab titles based on page focus.

Rotki is a local-first financial management suite designed for cryptocurrency portfolio tracking, tax accounting, and decentralized finance analytics. It functions as a self-hosted application that secures all financial records, transaction history, and user credentials within an encrypted local database, ensuring that sensitive data remains entirely under user control. The platform distinguishes itself through a privacy-preserving architecture that eliminates reliance on centralized cloud storage or third-party data providers. Users maintain full control over their connectivity by configurin

Directus is a headless content platform that functions as a backend service, automatically generating REST and GraphQL APIs by performing introspection on existing SQL database schemas. It serves as a unified data orchestration layer, decoupling content management from frontend delivery while providing a secure, stateless gateway for database transactions. The platform distinguishes itself through a granular role-based access control engine that enforces security policies at the field level across all API endpoints. It includes a visual, low-code administrative dashboard that allows non-techn

BlueWallet is a Bitcoin wallet application that provides a mobile interface for managing Bitcoin assets, including standard wallets and specialized tools for Lightning Network payments. It serves as a coordinator for various wallet types, including multisig vaults and watch-only interfaces. The project distinguishes itself through advanced security and privacy features, such as decoy storage architecture to hide assets during forced disclosure and custom entropy generation using physical dice or coins. It supports air-gapped transaction management via QR codes and PSBT integration for hardwar

Mac app that shows all open files, directories, sockets, pipes and devices in use by all running processes. Nice GUI for lsof.

The Odin Project is an open-source, full-stack web development curriculum that guides learners from basic scripting to deploying complete applications through a structured, project-based learning path. It functions as a self-directed bootcamp covering frontend, backend, databases, and job-seeking skills, with a peer-to-peer learning community where developers give and receive structured help through a forum. The platform distinguishes itself through a project-based curriculum engine that presents curated resources and assignments requiring independent problem-solving rather than step-by-step

SQLiteStudio is an open-source graphical tool for browsing, editing, and managing SQLite database files. It combines a full-featured SQL editor with syntax highlighting, a visual database schema designer for creating entity-relationship diagrams, and a plugin-based extensibility platform that allows adding custom functionality through C/C++, JavaScript, Tcl, or Python. The application distinguishes itself through its multi-language scripting engine, which embeds JavaScript, Tcl, and Python interpreters to enable user-defined functions and scripts within SQL queries. It supports encrypted data

Cointop is a terminal-based cryptocurrency dashboard that displays real-time market data, prices, and portfolio values in a text-based interface. It aggregates data from multiple cryptocurrency exchange APIs and presents it in an interactive terminal user interface with vim-inspired keyboard shortcuts for navigation and control. The application distinguishes itself by embedding an SSH server that allows remote access to the dashboard from any device, with persistent client configuration tied to individual SSH keys. It includes a fuzzy search system for quickly finding coins by name, desktop n