Open-source alternatives to Mqcloud

This project is a technical reference and documentation suite focused on the internal architecture and operational principles of the Java Virtual Machine. It provides comprehensive guides and analysis on how the virtual machine manages class loading, memory organization, and bytecode execution. The documentation distinguishes itself by providing deep dives into specific runtime mechanisms, such as the binary decoding of class files, the hierarchical delegation model for class loaders, and the precise sequence of the loading, linking, and initialization lifecycle. It also details memory reclam

Dozer is a Java Bean to Java Bean mapper that recursively copies data from one object to another.

Dromara MaxKey 🗝️ SSO ,Leading-Edge IAM-IDaas(Identity and Access Management) Product , Under Apache-2.0 is free ，业界领先的IAM-IDaas身份管理和认证产品，遵循Apache-2.0开源免费，支持OAuth2.x、OpenID Connect、SAML2.0、CAS、JWT、SCIM等SSO标准协议，基于RBAC统一权限控制，实现用户生命周期管理，开源、安全、合规、自主可控。

Sa-Token is a Java-based authentication and authorization framework designed to manage user sessions, permissions, and identity verification within web applications and microservice architectures. It provides a centralized security layer that enforces access control policies and identity validation across distributed service environments and API gateways. The framework distinguishes itself through its support for cross-domain single sign-on and its ability to function as an OAuth2 identity provider. It manages user session lifecycles by applying configurable rules for single or multi-login re

让简单的事情回归简单的本质。 SMS4J为短信聚合框架，帮您轻松集成多家短信服务，解决接入多个短信SDK的繁琐流程。 目前已接入数家常见的短信服务商，后续将会继续集成。后续的版本中我们还将推出更多的相关功能 你的 ⭐️ ⭐️⭐️Star⭐️⭐️ ⭐️，是我的动力！如果你觉得还不错，请点上一颗小星星

一行代码将文件存储到 本地、FTP、SFTP、WebDAV、谷歌云存储、阿里云OSS、华为云OBS、七牛云Kodo、腾讯云COS、百度云 BOS、又拍云USS、MinIO、 AWS S3、FastDFS、 Azure Blob Storage、金山云 KS3、美团云 MSS、京东云 OSS、天翼云 OOS、移动云 EOS、沃云 OSS、 网易数帆 NOS、Ucloud US3、青云 QingStor、平安云 OBS、首云 OSS、IBM COS、其它兼容 S3 协议的平台。后续即将支持 Samba、NFS

This repository serves as a comprehensive educational collection of industry-standard software design patterns and architectural principles implemented in Java. It functions as a structured reference for developers to study and apply proven strategies for building maintainable, object-oriented systems. The project acts as a knowledge base for software engineering, offering a curated set of programming heuristics and best practices. By providing ready-to-use implementations of standard design patterns, it enables developers to address common programming challenges and improve code modularity t

JustAuth is an OAuth 2.0 authentication library designed to integrate multiple third-party login providers into a single interface. It abstracts various social login APIs and identity services, allowing applications to manage authentication using the OAuth 2.0 and OIDC protocols. The project provides a multi-provider identity integrator that replaces the need for individual vendor software development kits. It includes a toolkit for defining custom authentication platforms and proprietary identity services by specifying custom OAuth protocols and endpoints. The library manages the full authe

支持Springboot，基于注解的可使用变量、可以自定义函数的通用操作日志组件

o2oa is an open-source Java enterprise office automation platform designed to manage corporate workflows, organizational hierarchies, and collaborative office tasks. It functions as a low-code business application platform and a corporate information portal, providing a visual development environment for building custom enterprise applications. The platform is distinguished by its integrated enterprise workflow engine, which allows for the design and automation of business processes using customizable routing conditions and event-driven scripts. It further differentiates itself as a multi-dat

OFD Reader & Writer 开源的OFD处理库，支持文档生成、数字签名、文档保护、文档合并、转换、导出等功能，文档格式遵循《GB/T 33190-2016 电子文件存储与交换格式版式文档》。

Screw is a database schema analysis tool used to automatically produce technical documentation and Java data objects. It scans database tables to export their definitions, transforming schema metadata into structured reports and application code. The project generates plain Java objects based on existing database table structures to automate data modeling. It also produces database schema documentation in HTML, Word, and Markdown formats. The system includes capabilities for table export filtering using name patterns, JDBC-based schema extraction, and template-based code generation to map da

Enterprise job scheduling middleware with distributed computing ability.

Quarkus is a Kubernetes-native Java framework designed for building high-performance, memory-efficient applications. It utilizes ahead-of-time native compilation to transform Java code into standalone, optimized binaries that eliminate the need for a virtual machine, enabling rapid startup and reduced memory consumption. By performing code augmentation during the build phase, it shifts heavy processing tasks away from runtime, ensuring that applications are optimized for cloud-native environments. The framework distinguishes itself through a unified approach to reactive and imperative program

poi-tl is a Java-based template engine for generating DOCX files. It functions as a document generator that populates predefined Word templates with dynamic data and logic to automate the production of reports and contracts. The library enables complex document assembly through recursive template nesting and conditional section rendering. It supports the embedding of images from local paths or URLs and the generation of dynamic tables and lists based on provided data structures. The system handles data-driven reporting by replacing placeholders while preserving original formatting and styles

CacheCloud is a cloud management platform and infrastructure orchestrator for Redis. It provides a centralized dashboard to deploy, scale, and monitor Redis instances across standalone, sentinel, and cluster architectures. The system standardizes operational workflows to reduce manual effort through automated deployment and maintenance processes. It enables elastic resource scaling via vertical and horizontal adjustments to optimize hardware utilization and manages high-availability transitions through automated failover. The platform includes a metadata-driven directory to track physical ma

一言·古诗词 API (Hitokoto API)，随机返回一条古诗词名句。采用 Vert.x Redis 全异步开发，毫秒级稳定响应。

This project is a comprehensive library of twenty-three standard software design patterns implemented in Java. It serves as an educational resource that maps theoretical architectural concepts to practical object-oriented code. The library organizes these patterns into three primary categories: creational patterns for managing object instantiation, structural patterns for organizing class and object relationships, and behavioral patterns for coordinating communication and responsibility between objects. The implementation provides concrete class examples for a wide range of industry-standard