Open-source alternatives to IBook

LibreraReader is a multi-format e-book reader and digital library manager designed for mobile and desktop devices. It functions as a customizable document renderer and a text-to-speech document player that converts written text into spoken audio via a configurable speech engine and integrated media player. The project distinguishes itself through a high degree of visual and functional customization, including the ability to inject custom CSS for styling overrides and the use of pluggable rendering engines to balance speed and stability. It includes specialized navigation tools such as a verti

This platform is a comprehensive, white-label software suite designed for launching and managing on-demand food delivery services. It provides a unified ecosystem that connects customers, restaurant staff, and delivery riders through integrated mobile and web interfaces, supported by a centralized backend infrastructure that synchronizes data and business logic across all user roles. The system distinguishes itself through its focus on self-hosted deployment, granting operators full control over their data, backups, and server environments. It supports multi-vertical business models, allowing

This project is a reference implementation and a collection of code samples for deploying the Apache Shiro security framework within Java-based web applications. It serves as a demonstration for implementing authentication, authorization, and user identity management. The implementation features distributed session management to coordinate user states across multiple server instances for high availability. It also includes samples for third-party OAuth2 integration, enabling external account authentication, and single sign-on support to grant access to multiple related applications. The proj

Horizon is a realtime API server and RethinkDB backend designed to push database changes instantly to front-end clients. It utilizes a WebSocket data streaming API to synchronize data between the database and user interfaces without requiring manual polling. The project integrates an OAuth identity manager for verifying user identities through third-party providers and a role-based access control system to define granular permissions for viewing or modifying database documents. It is delivered as a containerized backend framework, allowing the server and its dependencies to be deployed as a p

mall4j is a Java-based e-commerce platform and B2B2C commerce suite designed to manage retail operations across web, mobile, and H5 storefronts. It serves as an omnichannel backend and multi-tenant retail manager, providing the infrastructure to handle product catalogs, shopping carts, and order processing. The system is built on a Spring Boot microservice framework, featuring an omnichannel architecture that exposes a unified API gateway to power diverse client interfaces. It distinguishes itself through a B2B2C workflow that coordinates sales between administrators, merchants, and end consu

Security-101 is a vendor-agnostic, foundational cybersecurity learning curriculum organized into modular, framework-aligned modules. It is designed to build core knowledge across multiple security domains without tying content to specific products or platforms, making it suitable for both beginners and professionals seeking a structured introduction to the field. The curriculum is built around established security frameworks, including the MITRE ATT&CK framework for standardized threat analysis and the NIST Cybersecurity Framework for incident response workflows. It covers a broad range of do

InvenTree is an open-source inventory management platform built on Django, designed for tracking parts, stock levels, and supply chain operations through a web interface and REST API. The system uses barcodes—including QR codes, 1D barcodes, and Data Matrix codes—as primary identifiers for scanning, linking, and triggering inventory actions, and extends core functionality through a Python plugin framework supporting custom actions, UI panels, barcode handlers, and scheduled tasks. The platform distinguishes itself through a comprehensive plugin-based extensibility system that allows custom in

Shiro is a Java security framework that provides an identity and access manager for implementing authentication, authorization, cryptography, and session management. It serves as a security layer to verify user identities and enforce role-based access control for protected system resources. The project features a pluggable realm architecture that decouples security logic from identity data and a standalone session management system that tracks user state independently of the underlying servlet container. It includes an integrator for external identity providers using federation protocols such

LoopBack Next is a Node.js API framework used for building REST and multi-protocol APIs. It functions as an OpenAPI server implementation that can either generate machine-readable specifications from code or produce implementation controllers and models from existing specifications. The framework distinguishes itself through a central dependency injection container and a repository-pattern data access layer. This architecture decouples application logic from component construction and persistent storage, allowing for a pluggable system where data sources and business logic are isolated throug

Skateshop is a Next.js e-commerce storefront and subscription-based commerce platform. It provides a retail website featuring product catalogs, shopping carts, and checkout flows, paired with a retail store management dashboard for tracking inventory, orders, and payments. The project includes a subscription system to process recurring payments and manage tiered access to premium services. It also integrates a markdown blog engine for publishing technical content and an email marketing system to collect subscribers and distribute newsletters. The platform covers identity management through u

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

Spring Security is a comprehensive security framework for Java applications that provides authentication and authorization for both web and non-web environments. It functions as an implementation of authentication and authorization logic integrated with the Java runtime environment to protect sensitive resources from unauthorized access. The framework includes toolkits for implementing OpenID Connect and OAuth 2.0 authorization servers and clients, as well as tools for integrating SAML 2.0 identity providers to enable cross-domain single sign-on. It utilizes a role-based access control system

Calibre-web is a self-hosted web application that provides a browser-based interface for browsing, managing, and reading digital book collections stored in a library database. It functions as a comprehensive library management system, allowing users to organize large collections, edit metadata, and perform automated content updates through a centralized administrative dashboard. The platform distinguishes itself by integrating directly with external infrastructure to extend the capabilities of a standard digital library. It supports remote storage mapping to host files on cloud providers, uti

GraphQL.NET is a server-side framework for building and executing GraphQL APIs within C# applications. It provides a comprehensive toolkit for schema building, a federated engine for distributed data graphs, and a subscription handler for managing real-time data streams. The project distinguishes itself with a flexible schema builder that supports both programmatic code-first definitions and declarative schema-first approaches using the standard schema definition language. It includes a dedicated federation engine to split data graphs into subgraphs and compose them into a unified gateway, as

Tsuru is an open-source platform as a service for automating the build, deployment, and scaling of containerized applications. It functions as a container-based deployment engine and a management layer for Kubernetes, transforming source code into container images and coordinating their lifecycles. The platform is designed for multi-cloud infrastructure management, allowing applications to be distributed across different cloud providers and regions to increase resilience. It features a flexible deployment model that supports multi-process containers, enabling a single repository to run differ

This project is a self-hosted question and answer platform and knowledge management system. It provides a centralized repository for documented answers and community discussions used to support users and resolve technical issues. The system functions as a plugin-based community forum, utilizing a modular extension system to add custom features and tools. It employs a decoupled architecture with a RESTful API backend to separate business logic from the user interface. The platform covers several domain areas including internal knowledge management, customer help centers, and community Q&A hos

PowerDNS-Admin is a web-based management interface and administration tool for PowerDNS. It provides a graphical dashboard to manage DNS zones and resource records, replacing the need for manual configuration file edits or command line tools. The system implements a role-based access control layer to restrict zone visibility and administrative functions based on assigned user permissions. It includes a dedicated server monitor for tracking the health, configuration, and performance statistics of PowerDNS backend servers. The platform covers a broad range of administrative capabilities, inclu

bbs-go is a community forum software written in Go. It functions as a gamified community platform and social network framework, providing tools for hosting public discussions, managing knowledge bases, and coordinating user identities. The platform is distinguished by an integrated gamification engine that tracks activity via daily check-ins and reward tasks to award experience points, levels, and badges. It also features a specialized identity and access manager that supports role-based access control and third-party identity federation, including Google Sign-In integration. The system cove

SpringCloud is a development platform for building distributed systems and cloud-native microservices. It provides an integrated framework for microservice development, incorporating service governance, security, and system coordination. The platform features a microservice gateway for managing traffic through dynamic routing and rate limiting, alongside a service registry for discovery. It implements distributed security through token-based authentication, role-based access control, and a specialized system that uses aspect-oriented programming to automatically enforce data-level permissions

Gauzy is an open business management platform and multi-tenant enterprise resource planning system. It provides a modular business framework designed to manage core organizational operations through a unified web interface or as a headless business API. The platform is distinguished by its integration with the Model Context Protocol, allowing it to act as a server that exposes business data and system functions as tools for AI assistants. It utilizes a dynamic plugin architecture and a dedicated marketplace to extend core business entities and services. The system covers a broad range of ope

DbGate is a universal database management tool and SQL client that provides a unified interface for querying and administering multiple SQL and NoSQL databases. It functions as a multi-database administration GUI and SQL IDE, allowing users to write and execute scripts and manage database schemas. The project distinguishes itself by acting as an API client and explorer for REST, GraphQL, and OData services, enabling users to fetch and export data from these endpoints. It also serves as a data integration tool, facilitating the movement of records between diverse databases and file formats suc

Kavita is a self-hosted digital library server designed for hosting, organizing, and sharing collections of digital books, comics, and magazines across multiple devices. It functions as a digital media metadata manager and an OPDS content server, enabling the distribution of publications to compatible reading applications. The system includes a cross-platform web-based reader that supports digital book annotations and highlights. It utilizes a role-based access control system to manage user permissions and enforce age restrictions for shared libraries. The platform provides comprehensive lib

Jeesite is a full-stack low-code development framework designed for building enterprise administrative portals using Spring Boot, MyBatis, and Vue. It functions as a comprehensive platform for creating administrative dashboards with integrated role-based access control and organizational data permission systems. The framework distinguishes itself through a combination of automated CRUD code generation and an integrated RAG platform that connects large language models to enterprise data via vector stores. It further incorporates a BPMN-based workflow engine to automate complex business process

This is a role-based access control system for Laravel applications that manages user permissions and roles within a database. It provides a database permissions manager to assign specific abilities to users and roles, utilizing authorization gates to restrict access to routes and interface elements. The project features a wildcard permission system that uses pattern matching to grant broad access across multiple related permissions. It also supports team-scoped access control, allowing users to maintain different roles and permission levels across separate organizational contexts or teams.

PoWFaucet is a blockchain fund management tool and distribution gateway designed to operate as an EVM-compatible crypto faucet. It automates the delivery of native network currencies and ERC20 tokens to users while managing hot wallet liquidity through automated refills from secure vault contracts. The system focuses on sybil resistance by integrating multiple layers of verification. It employs proof of work requirements, captcha challenges, and identity verification via Gitcoin Passport, GitHub, and Zupass zero-knowledge proofs to determine user eligibility and modulate reward amounts. Dist

Eve is a REST API framework that maps database collections to web resources through declarative configuration files. It functions as a database-to-API mapper, automatically exposing data as RESTful endpoints with built-in support for CRUD operations and schema-based request validation. The project distinguishes itself through a HATEOAS API engine that generates hypermedia links and resource schemas for dynamic client discovery. It also includes an automated Swagger documentation generator that produces interactive specifications for client SDK generation and testing. The framework provides a

Libredesk is an omnichannel support management system designed to unify live chat and email communications into a single dashboard. It provides a comprehensive environment for managing customer interactions, agent roles, and team assignments to organize support workloads. The project distinguishes itself through AI customer support automation, which includes generating automated responses and refining message tones. It also supports the development and integration of custom chat widgets using WebSockets and JavaScript APIs. The system covers a broad set of capabilities, including customer re