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.

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  • 1
    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: 10 This Week
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  • 2
    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: 30 This Week
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  • 3
    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: 5 This Week
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  • 4
    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: 21 This Week
    Last Update:
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  • 5
    Java JWT

    Java JWT

    Java implementation of JSON Web Token (JWT)

    A Java implementation of JSON Web Token (JWT) - RFC 7519. This library requires Java 8 or higher. The last version that supported Java 7 was 3.11.0. The library implements JWT Verification and Signing using several algorithms. The Algorithm defines how a token is signed and verified. It can be instantiated with the raw value of the secret in the case of HMAC algorithms, or the key pairs or KeyProvider in the case of RSA and ECDSA algorithms. Once created, the instance is reusable for token signing and verification operations. When using RSA or ECDSA algorithms and you just need to sign JWTs you can avoid specifying a Public Key by passing a null value. The same can be done with the Private Key when you just need to verify JWTs.
    Downloads: 4 This Week
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  • 6
    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: 4 This Week
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  • 7
    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: 50 This Week
    Last Update:
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  • 8
    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: 6 This Week
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  • 9
    crawler4j

    crawler4j

    Open source web crawler for Java

    crawler4j is an open source web crawler for Java which provides a simple interface for crawling the Web. Using it, you can setup a multi-threaded web crawler in few minutes. You need to create a crawler class that extends WebCrawler. This class decides which URLs should be crawled and handles the downloaded page. shouldVisit function decides whether the given URL should be crawled or not. In the above example, this example is not allowing .css, .js and media files and only allows pages within ics domain. visit function is called after the content of a URL is downloaded successfully. You can easily get the url, text, links, html, and unique id of the downloaded page. You should also implement a controller class which specifies the seeds of the crawl, the folder in which intermediate crawl data should be stored and the number of concurrent threads.
    Downloads: 1 This Week
    Last Update:
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  • 10
    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: 13 This Week
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  • 11
    S-FENG stands for Semantic-FEderation Next Generation. S-FENG represents the solution for managing federation of registries with its related aspects: affiliation, promotion, semantic publication and discovery, according to UDDI 3.0.2 specifications.
    Downloads: 8 This Week
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  • 12
    Java library for access to Moodle's web services via the REST protocol (09/11/2013) Development of this project has been resurrected and the current code may be downloaded from https://github.com/bantonia/MoodleRest A compiled .jar will be available here once the code has been finalized. (30/03/2012 A newer version (V0.1.5) to work with Moodle 2.2 has been uploaded. Although still requires more documentation (better than it was) etc... Calls to create and update users now provides facilities to add preferences and customfields. Removed the batch calling of the web services (not needed as all calls are via POST and not GET), code is still there but commented out. V0.1.4 was removed, too many bugs! Previous versions using the Moodle 2.1 webservice calls are still here. Code for the next release which is under development can be downloaded from: https://github.com/bantonia/MoodleRest Note: The software is supplied as is under the GNU version 2.0 License.
    Downloads: 6 This Week
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  • 13
    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: 20 This Week
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  • 14
    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: 17 This Week
    Last Update:
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  • 15
    JMEDS (Java Multi Edition DPWS Stack)

    JMEDS (Java Multi Edition DPWS Stack)

    JMEDS is a lightweight, modular extendable Java Framework for DPWS.

    JMEDS is a lightweight, modular and extendable software framework for using the "Devices Profile for Web-Services (DPWS)" in Java based environments. It runs on Java CLDC (e.g. on embedded devices), CDC, Android and SE platforms. 12.02.2014 v2.0.0 beta 10 fixed the EXI release and included schema files for EXI's schema informed mode, multiple other bug fixes 25.09.2013 Bugfix release of JMEDS Framework: v2.0.0 beta 9a 30.08.2013 v2.0.0 beta 9 New version of JMEDS Framework We are doing our best to answer all questions from you and fix the bugs that are found as fast as we can! So don't hesitate to ask questions or report unexpected behaviour/bugs that you might find. DPWS Explorer released on http://ws4d.e-technik.uni-rostock.de/dpws-explorer/
    Downloads: 4 This Week
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  • 16
    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: 3 This Week
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  • 17
    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: 6 This Week
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  • 18
    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: 6 This Week
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  • 19
    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: 2 This Week
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  • 20
    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: 10 This Week
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  • 21
    Asterisk PBX Integration Zimlet is an Extension for Zimbra Collaboration Suite. The Zimlet does Interface with the Asterisk Manager Interface to integrate with Asterisk PBX. The main focus is dial-on-click for Phone numbers inside Contacts and Emails.
    Downloads: 2 This Week
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  • 22
    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: 2 This Week
    Last Update:
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  • 23
    FeedTurtle
    RSS reader, multimedia manager and TV series manager
    Downloads: 3 This Week
    Last Update:
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  • 24
    HHS Digital Media API Platform

    HHS Digital Media API Platform

    Syndicate text and multimedia content with this API and storefront.

    Use this suite of Application Programming Interface (API) platforms to share web content across multiple channels. Mobile and tablet applications, widgets, and web pages may use the APIs to deliver and update content. The APIs allow content reuse and reduce development costs and product time-to-market. The APIs are available as .NET or Java instances. For more information, see the ReadMe.txt file in the downloadable zip archive. The Centers for Disease Control and Prevention (CDC) and the Department of Health and Human Services (HHS) Assistant Secretary for Public Affairs office (ASPA) developed these APIs in collaboration with the Food and Drug Administration’s (FDA) Center for Tobacco Products (CTP). The CDC, FDA/CTP, HHS/ASPA, and the National Institute of Health’s National Institute for Allergy and Infectious Diseases (NIH/NIAID) use these platforms. https://syndication.hhs.gov http://tools.cdc.gov http://tools.niaid.nih.gov http://tools.fda.gov
    Downloads: 3 This Week
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  • 25
    A P2P overlay construction toolkit, which supports routing algorithm researchers in addition to application developers. It provides multiple routing (DHT) algorithms such as Chord, Kademlia, Koorde, Pastry and Tapestry, and a distributed environment emu
    Downloads: 5 This Week
    Last Update:
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