Browse free open source Java Frameworks and projects below. Use the toggles on the left to filter open source Java Frameworks by OS, license, language, programming language, and project status.

  • Ship AI Apps Faster with Vertex AI Icon
    Ship AI Apps Faster with Vertex AI

    Go from idea to deployed AI app without managing infrastructure. Vertex AI offers one platform for the entire AI development lifecycle.

    Ship AI apps and features faster with Vertex AI—your end-to-end AI platform. Access Gemini 3 and 200+ foundation models, fine-tune for your needs, and deploy with enterprise-grade MLOps. Build chatbots, agents, or custom models. New customers get $300 in free credit.
    Try Vertex AI Free
  • Go from Data Warehouse to Data and AI platform with BigQuery Icon
    Go from Data Warehouse to Data and AI platform with BigQuery

    Build, train, and run ML models with simple SQL. Automate data prep, analysis, and predictions with built-in AI assistance from Gemini.

    BigQuery is more than a data warehouse—it's an autonomous data-to-AI platform. Use familiar SQL to train ML models, run time-series forecasts, and generate AI-powered insights with native Gemini integration. Built-in agents handle data engineering and data science workflows automatically. Get $300 in free credit, query 1 TB, and store 10 GB free monthly.
    Try BigQuery Free
  • 1
    A framework of data entry and reporting plugins that are used to build basic accounting modules. These, in turn, are used to build accounting software for home, club and societies, small business and specific industry applications.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 2
    A toolbox for java gameservers. This project extends the open source gameserver "project darkstar", written by Sun microsystems. It provides several useful tools like telnet administration, object browsing, base classes for network services.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 3
    Add-on package for Seam Framework providing convenient integration with Perf4j - performance monitoring library for Java applications.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 4
    Performance oriented data structures and other programming utilities for Java that are meant to replace those provided by Java. They are designed to provide a solid backbone for any software project.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Managed MySQL, PostgreSQL, and SQL Databases on Google Cloud Icon
    Managed MySQL, PostgreSQL, and SQL Databases on Google Cloud

    Get back to your application and leave the database to us. Cloud SQL automatically handles backups, replication, and scaling.

    Cloud SQL is a fully managed relational database for MySQL, PostgreSQL, and SQL Server. We handle patching, backups, replication, encryption, and failover—so you can focus on your app. Migrate from on-prem or other clouds with free Database Migration Service. IDC found customers achieved 246% ROI. New customers get $300 in credits plus a 30-day free trial.
    Try Cloud SQL Free
  • 5
    The Perola consists of a framework for persistence that separates business model objects from persistence itself, in such a way it is finally possible to put in practice the dream of OO purism. To accomplish this, AOP concepts and reflection are used.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 6
    Persistent objects for Java provides a framework to store Java objects in relational databases via JDBC/SQL. It consist out of the library, a number of related tools and standard libraries on top of it.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    This project is aim to Full implementation of JPA spcification. And purpose to satisfied all ORM(Object-Relational Mapping) general idea.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    This project provides a middleware framework for the provision and operation of a Personal Smart Space (PSS). The PSS is a means for sharing services, and information, while automating certain actions and learning about the usage habits of the user.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    Petaapan is exploring the opportunities that multi-touch displays present. Initially we are looking at tools to support agile development to provide a concrete target for the investigations.
    Downloads: 0 This Week
    Last Update:
    See Project
  • AI-generated apps that pass security review Icon
    AI-generated apps that pass security review

    Stop waiting on engineering. Build production-ready internal tools with AI—on your company data, in your cloud.

    Retool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
    Try Retool free
  • 10
    Java Archtecture for web deployment with Spring, Hibernate and Flex (based GraniteDS)
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11
    Photon provides very fast access to data containers (queues, maps, etc.) in shared memory - it can retrieve millions of data records per second. It also uses some RDB concepts like transactions and crash recovery. See web site for details.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    The Physical Mobile Interaction Framework (PMIF) facilitates the development of Java ME applications that interact with objects in the real world. PMIF provides a common interface to the different technologies behind these interactions.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13
    Yet another database mapping library
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    Piggy back is a POC for a development technique targeted at Swing applications. The idea is that layers of services piggy back on another layer to provide maximum reuse and modularity. Consists of a API written in Java and wrapped a type 3 IOC engine
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    Pika is a lightweight implementation of JSR-283 (JCR Java Content Repository).
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    A web based multiple choice quiz/test application framework
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    We create this frame to simplify designing J2me applications and games. With it, the developers do not need to start from zero, so they can develop their applications more efficiently.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    An open source plugin framework built for the PircBot Java IRC Bot Framework
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    Piu Framework is a Java/J2EE framework that simplifies Java enterprise development, while at the same time assuring that architectures backed by the framework can scale upwards and downwards to most accurately handle actual demands of your applications.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    Stable 3rd party modules/plugins/APIs for the NetBeans Platform/RCP.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    PlayAuthenticate

    PlayAuthenticate

    An authentication plugin for Play Framework 2.x (Java)

    Fully customizable and localizable controllers and views (e.g. Play Authenticate allows you to define your own controllers and views for every visual step of the signup and/or log in process). Completely dynamic URL generation for all views (uses the route file - means you can adapt the look and feel as much as you like). The sample shows how to do this with Twitter bootstrap. Linking of accounts (e.g. one local user with multiple authentication providers). Linking can be done automatically or after asking the user (default) Merge detection (e.g. a user created two unconnected local accounts) Account merge can be done automatically or after asking the user (default) Tight deadbolt2 authorization integration (Sample included). HTTPS support (for OAuth2 redirect links and email verification). Verification email used by Email/Password provider is fully customizable and localizable and can be sent in either text or HTML or both.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    This project aims to enable new developers to make a simple Go playing engine and have it play on an on-line server in 10 minutes.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    PlugWork is an framework for development of plug-in architectures in Java with integrated event system for plug-ins to communicate with each other.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    The Plugin Framework for Java is a distributed Plugin framework. It will enable users to write distributed application by just writing simple Plugins. It will come with Plugin clustering, central plugin registry and load balancing.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    Plugin Message Transport Protocol is a Library, Router for Plugin Messages. The Library makes it easy to build Applications that need to send messages to each other in a structured way.
    Downloads: 0 This Week
    Last Update:
    See Project
MongoDB Logo MongoDB
Gen AI apps are built with MongoDB Atlas
Atlas offers built-in vector search and global availability across 125+ regions. Start building AI apps faster, all in one place.
Try Free →