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

  • Retool your internal operations Icon
    Retool your internal operations

    Generate secure, production-grade apps that connect to your business data. Not just prototypes, but tools your team can actually deploy.

    Build internal software that meets enterprise security standards without waiting on engineering resources. Retool connects to your databases, APIs, and data sources while maintaining the permissions and controls you need. Create custom dashboards, admin tools, and workflows from natural language prompts—all deployed in your cloud with security baked in. Stop duct-taping operations together, start building in Retool.
    Build an app in Retool
  • Find Hidden Risks in Windows Task Scheduler Icon
    Find Hidden Risks in Windows Task Scheduler

    Free diagnostic script reveals configuration issues, error patterns, and security risks. Instant HTML report.

    Windows Task Scheduler might be hiding critical failures. Download the free JAMS diagnostic tool to uncover problems before they impact production—get a color-coded risk report with clear remediation steps in minutes.
    Download Free Tool
  • 1
    Apache Guacamole

    Apache Guacamole

    HTML5 Clientless Remote Desktop

    Apache Guacamole is a clientless remote desktop gateway. It supports standard protocols like VNC, RDP, and SSH. We call it clientless because no plugins or client software are required. Thanks to HTML5, once Guacamole is installed on a server, all you need to access your desktops is a web browser.
    Downloads: 40 This Week
    Last Update:
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  • 2
    Zuul

    Zuul

    Gateway service providing dynamic routing, monitoring and more

    Zuul is an L7 application gateway that offers many capabilities, including dynamic routing, monitoring, security, resiliency and more. It is used in the backend of the Netflix streaming service as a front door for all requests from devices and web sites. Zuul is ideal for cases like this where API traffic volume and diversity can become overwhelming and cause production issues to arise suddenly and without warning. Zuul has a broad range of filters that enable it to perform multiple functions quickly and apply functionality to services like Netflix. These functions include security authentication, dynamic routing, stress testing, load shedding and more.
    Downloads: 9 This Week
    Last Update:
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  • 3
    Nomulus

    Nomulus

    Top-level domain name registry service on Google Cloud Platform

    Nomulus is a production-grade, open-source domain registry platform used to operate top-level domains (TLDs). It implements the core registry protocols—EPP for registrar interactions, WHOIS/RDAP for public data access—and manages the lifecycle of domain objects, hosts, and contacts. The system is built to scale and to enforce policy: pricing rules, reserved names, premium tiers, grace periods, and automated renewals are modeled explicitly. It integrates with DNS provisioning, data escrow, and billing so you can run a compliant registry end-to-end rather than stitching together separate services. Operators get admin tools for reporting, manual adjustments, and policy configuration, while registrars interact through standards-compliant channels. Nomulus treats registries as serious infrastructure: audited flows, durable storage, and clear extension points for custom policies and TLD-specific behavior.
    Downloads: 3 This Week
    Last Update:
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  • 4
    GeoWebCache

    GeoWebCache

    GWC is a tile server and caching proxy written in Java

    GeoWebCache is a WMS tile cache that lets you serve cached map data to WMS clients, Goole Earth, Google Maps and MS Virtual Earth. The system is pluggable on both ends and does automatic matching to the best available tile. It is very fast and scalable.
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    Downloads: 61 This Week
    Last Update:
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  • Atera all-in-one platform IT management software with AI agents Icon
    Atera all-in-one platform IT management software with AI agents

    Ideal for internal IT departments or managed service providers (MSPs)

    Atera’s AI agents don’t just assist, they act. From detection to resolution, they handle incidents and requests instantly, taking your IT management from automated to autonomous.
    Learn More
  • 5
    HelloNzb

    HelloNzb

    The Binary Usenet Tool

    With HelloNzb you can download (binary) files from Usenet servers via NZB index files. The software is based on Java and can thus run on many platforms (tested on Windows and Linux). Automatic archive verification via PAR2, automatic RAR archive extraction, built-in yEnc- and UU-decoding. Portable, no installation required.
    Downloads: 9 This Week
    Last Update:
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  • 6
    ZK - Simply Ajax and Mobile
    ZK is an open-source Java framework for building modern web and mobile applications. It enables developers to create rich, interactive UIs using only Java — no JavaScript required. With 200+ Ajax-powered components, event-driven architecture, and support for popular technologies like Spring, Java EE, and JSP/JSF, ZK makes it simple to deliver powerful and user-friendly web applications.
    Downloads: 6 This Week
    Last Update:
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  • 7
    Sentinel

    Sentinel

    Lightweight, powerful flow control component

    Sentinel is a powerful flow control component that ensures the reliability and monitoring of microservices by taking “flow” as the breakthrough point. It covers multiple fields including flow control, concurrency limiting, circuit breaking, and adaptive system protection.
    Downloads: 1 This Week
    Last Update:
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  • 8
    mendelson AS4

    mendelson AS4

    AS4 Solution for ENTSOG, e-SENS, ebMS, PEPPOL, ICS2, BDEW

    mendelson AS4 is a free JAVA-based open source AS4 solution. Contains a monitoring- and configuration GUI (SWING), supports PUSH and PULL messages, ENTSOG AS4, e-SENS AS4, ebMS AS4, BDEW AS4, PEPPOL AS4, ICS2 AS4, signatures (SOAP, payload), selectable profile per trading partner, encryption (SOAP, payload), UserNameToken, TLS, pluggable into any servlet container, trading partner management, compression, certificate management
    Downloads: 17 This Week
    Last Update:
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  • 9
    SoapUI
    The SoapUI download has moved to https://www.soapui.org/downloads/soapui/source-forge.html With more than 9 million downloads SoapUI is the de-facto standard for REST and SOAP API functional, security and performance testing.
    Downloads: 3 This Week
    Last Update:
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  • Grafana: The open and composable observability platform Icon
    Grafana: The open and composable observability platform

    Faster answers, predictable costs, and no lock-in built by the team helping to make observability accessible to anyone.

    Grafana is the open source analytics & monitoring solution for every database.
    Learn More
  • 10
    EXIficient
    NOTE: we moved to http://exificient.github.io !!! The Efficient XML Interchange (EXI) format is a very compact representation for the Extensible Markup Language (XML) Information Set that is intended to simultaneously optimize performance and the utilization of computational resources. Besides the EXI library EXIficient provides a command-line interface (CLI, see com.siemens.ct.exi.cmd.EXIficientCMD) and a graphical user interface (GUI, see http://exificient.sourceforge.net/exificient.jnlp)
    Downloads: 3 This Week
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  • 11
    MActor is an extensible tool for functional integration testing. It can facilitate tests a range of integration technologies (support for JMS, XML over HTTP, SOAP, TIBCO Rv, IBM MQ series and file-shares are currently supplied with the tool)
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    Downloads: 10 This Week
    Last Update:
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  • 12
    Scribe
    Scribe is a CMS for the Liferay Portal framework. It includes Web Content Management as well as Learning Management System features.
    Downloads: 3 This Week
    Last Update:
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  • 13
    OpenVPN ALS is a web-based SSL VPN server written in Java. It has a browser-based AJAX UI which allows easy access to intranet services. OpenVPN ALS is a direct descendant of Adito, which was a fork of SSL-Explorer.
    Downloads: 1 This Week
    Last Update:
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  • 14
    WebLOAD
    This project is intended for ISVs, SIs and software developers who need to integrate load generation engine into their applications. For enterprise load and performance testing initiatives, RadView offers WebLOAD Professional, a complete solution for creating, executing and analyzing the performance of web applications under load.
    Downloads: 3 This Week
    Last Update:
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  • 15
    Galleon is a home media server using TiVo's discontinued HME protocol. It only works on TiVo versions earlier than 20.7.2. The project is not actively maintained. If you want to maintain it, contact the admins.
    Downloads: 1 This Week
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  • 16
    Ajax Portal (WebOS and Portal)
    Ajax Portal (WebOS & Enterprise Portal). Ajax Portal is open source cross-platform cross-browser Web 2.0 / Web 3.0 solution which is based on a new architecture of WebOS and Enterprise Portals. Our Enterprise Portal can work as Mashup (WOA approach). The portal provides Portlet/Portal API, Services. It's posible to use the Decoration module of the portal as a part of the standard Web application (Web 2.0 / Web 3.0 application). Open Source allows you to try and evaluate our Web 2.0 / Web 3.0 Enterprise Ajax Portal for free.
    Downloads: 2 This Week
    Last Update:
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  • 17
    Metl ETL Data Integration

    Metl ETL Data Integration

    Simple message-based, web-based ETL integration

    Metl is a simple, web-based ETL tool that allows for data integrations including database, files, messaging, and web services. Supports RDBMS, SOAP, HTTP, FTP, SFTP, XML, FIXLEN, CSV, JSON, ZIP, and more. Metl implements scheduled integration tasks without the need for custom coding or heavy infrastructure. It can be deployed in the cloud or in an internal data center, and it was built to allow developers to extend it with custom components.
    Downloads: 2 This Week
    Last Update:
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  • 18
    Online wish list, where people list what they want and people claim from the list. Integrating with online stores and other wishlists assists users. A high level of secrecy is desirable to maintain the mystery of presents, while still being easy to u
    Downloads: 2 This Week
    Last Update:
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  • 19
    XINS is an open-source Web Services technology, supporting SOAP, XML-RPC and REST. It consists mainly of an XML-based specification format and a Java-based implementation framework.
    Downloads: 2 This Week
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  • 20
    Jitterbit is an open source integration tool that delivers a quick and simple way to design, configure, test, and deploy integration solutions. It supports many document types and protocols: XML, web services, database, LDAP, text, FTP, HTTP(S), file
    Downloads: 1 This Week
    Last Update:
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  • 21

    NextBus Public Feed Adapter for Java

    A Java adapter for the NextBus Public XML Feed Service

    Restful Web Service adapter for the NextBus prediction and transit network reporting service. This implementation uses XSD Schema, JAXB and a domain object model to decouple the consuming application from the over-the-wire representation of the data. NextBus is currently providing real-time bus data in several major metro transit agencies including, but not limited to MBTA (Boston), Toronto, Seattle, Brooklyn, Staten Island as well as a number of University towns. In additional to the standalone Adapter, an Enterprise Service Bus pump and demonstration subscription client are available for those interested in Asynchronous integration of the transit feed.
    Downloads: 1 This Week
    Last Update:
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  • 22
    Opal Toolkit
    Opal is a toolkit for wrapping scientific applications as Web services on Cluster, Grid and Cloud resources with ease. Users may access these software as a service using simple Web service APIs from their custom application and workflow environment.
    Downloads: 1 This Week
    Last Update:
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  • 23
    RSS Reader is a mobile J2ME (Java ME) app. that runs on Java enabled phones. User can store multiple RSS/ATOM feeds as bookmarks. Can import from OPLM file or HTML file with links. Can read offline. MIDP 2.0/some MIDP 1.0. Specify which MIDP w/issue
    Leader badge
    Downloads: 1 This Week
    Last Update:
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  • 24
    The Vexi Platform
    Vexi is a rich GUI platform for creating desktop-like Internet or intranet applications using an intuitive XML/JavaScript API and an extensible widget set with themes, JSON support. Communicate with servers using XMLRPC/SOAP/REST and runs on Java.
    Downloads: 1 This Week
    Last Update:
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  • 25
    This project consists in a java JRS-168 portlet that acts as a generic client for SOAP services. The user interface for calling the service is dynamicaly created using a WSDL description.
    Downloads: 1 This Week
    Last Update:
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