Free software programmed in Java

TightVNC is a free and open-source remote desktop software server and client application for Linux and Windows. A server for macOS is available under a commercial source code license only, without SDK or binary version provided. Constantin Kaplinsky developed TightVNC, using and extending the RFB protocol of Virtual Network Computing (VNC) to allow end-users to control another computer's screen remotely.

open source, non-relational, distributed database system

free and open-source interior design and home-planning software

gvSIG, geographic information system (GIS), is a desktop application designed for capturing, storing, handling, analyzing and deploying any kind of referenced geographic information in order to solve complex management and planning problems. gvSIG is known for having a user-friendly interface, being able to access the most common formats, both vector and raster ones. It features a wide range of tools for working with geographic-like information (query tools, layout creation, geoprocessing, networks, etc.). Integrating in the same view both local (files, databases) and remote data through OGC

Freeplane is a free, open source software application for creating mind maps (diagrams of connections between ideas), and electronic outlines. Written in Java, it is supported on Windows, Mac OS X and Linux, and is licensed under the GNU GPL version "2 or later".

database engine

XWiki is a free and open source wiki software platform written in Java with a design emphasis on extensibility. XWiki is an enterprise wiki. It includes WYSIWYG editing, OpenDocument-based document import/export, annotations and tagging, and advanced permissions management.

ImageJ is a Java-based image processing program developed at the National Institutes of Health and the Laboratory for Optical and Computational Instrumentation (LOCI, University of Wisconsin). Its first version, ImageJ 1.x, is developed in the public domain, while ImageJ2 and the related projects SciJava, ImgLib2, and SCIFIO are licensed with a permissive BSD-2 license. ImageJ was designed with an open architecture that provides extensibility via Java plugins and recordable macros. Custom acquisition, analysis and processing plugins can be developed using ImageJ's built-in editor and a Java co

BlueJ is an integrated development environment (IDE) for the Java programming language, developed mainly for educational purposes, but also suitable for small-scale software development. It runs with the help of Java Development Kit (JDK).

open source software package for 3D graphics

open-source cloud computing software

Eclipse Deeplearning4j is a programming library written in Java for the Java virtual machine (JVM). It is a framework with wide support for deep learning algorithms. Deeplearning4j includes implementations of the restricted Boltzmann machine, deep belief net, deep autoencoder, stacked denoising autoencoder and recursive neural tensor network, word2vec, doc2vec, and GloVe. These algorithms all include distributed parallel versions that integrate with Apache Hadoop and Spark.

CrypTool is an open-source project that is a free e-learning software for illustrating cryptographic and cryptanalytic concepts.

open-source PDF utility software

Cyberduck is an open-source client for FTP and SFTP, WebDAV, and cloud storage (OpenStack Swift, Amazon S3, Backblaze B2 and Microsoft Azure), available for macOS and Windows (as of version 4.0) licensed under the GPL. Cyberduck is written in Java and C# using the Cocoa user interface framework on macOS and Windows Forms on Windows. It supports FTP/TLS (FTP secured over SSL/TLS), using AUTH TLS as well as directory synchronization. The user interacts with the user interface (GUI), including file transfer by drag and drop and notifications via Growl. It is also able to open some files in extern

circuit-design system

jMonkeyEngine (abbreviated JME or jME) is an open-source and cross-platform game engine for developing 3D games written in Java. It can be used to write games for Windows, Linux, macOS, Raspberry Pi, Android, and iOS (currently in alpha testing). It uses Lightweight Java Game Library as its default renderer, and also supports another renderer based on Java OpenGL.

JabRef is an open-source, cross-platform citation and reference management software. It is used to collect, organize and search bibliographic information.

TextSecure was an encrypted messaging application for Android that was developed from 2010 to 2015. It was a predecessor to Signal and the first application to use the Signal Protocol, which has since been implemented into WhatsApp and other applications. TextSecure used end-to-end encryption to secure the transmission of text messages, group messages, attachments and media messages to other TextSecure users.

DBeaver is a SQL client software application and a database administration tool. For relational databases it uses the JDBC application programming interface (API) to interact with databases via a JDBC driver. For other databases (NoSQL) it uses proprietary database drivers. It provides an editor that supports code completion and syntax highlighting. It provides a plug-in architecture (based on the Eclipse plugins architecture) that allows users to modify much of the application's behavior to provide database-specific functionality or features that are database-independent. It is written in Jav

continuous integration tool

ADempiere is an enterprise resource planning (ERP) software package released under a free software license. The verb adempiere in Italian means "to fulfill a duty" or "to accomplish".

NXT is an open source cryptocurrency and payment network launched in 2013 by anonymous software developer BCNext. It uses proof-of-stake to reach consensus for transactions—as such, there is a static money supply. Unlike Bitcoin, there is no mining. NXT was specifically conceived as a flexible platform around build applications and financial services, and serves as basis for ARDR (Ardor), a blockchain-as-a-service multichain platform developed by Jelurida, and IoTeX (cryptocurrency) the current steward of NXT as of 2021. NXT has been covered extensively in the "Call for Evidence" report by ESM

FreeOTP is a free and open-source authenticator by Red Hat. It implements multi-factor authentication using HOTP and TOTP. Tokens can be added by scanning a QR code or by manually entering the token configuration. It is licensed under the Apache 2.0 license, and supports Android and iOS.

Open-source distributed SQL query engine

OpenNebula is an open source cloud computing platform for managing heterogeneous data center, public cloud and edge computing infrastructure resources. OpenNebula manages on-premises and remote virtual infrastructure to build private, public, or hybrid implementations of infrastructure as a service (IaaS) and multi-tenant Kubernetes deployments. The two primary uses of the OpenNebula platform are data center virtualization and cloud deployments based on the KVM hypervisor, LXC system containers, and AWS Firecracker microVMs. The platform is also capable of offering the cloud infrastructure nec

The Lightweight Java Game Library (LWJGL) is an open-source software library that provides bindings to a variety of C libraries for video game developers to Java. It exposes cross-platform libraries commonly used in developing video games and multimedia titles, such as Vulkan, OpenGL, GLFW, OpenAL and OpenCL.

OpenProj was an open-source project management software application.

PlantUML is an open-source tool allowing users to create diagrams from a plain text language. Besides various UML diagrams, PlantUML has support for various other software development related formats (such as Archimate, Block diagram, BPMN, C4, Computer network diagram, ERD, Gantt chart, Mind map, and WBD), as well as visualisation of JSON and YAML files.

computer accessibility tool

encrypted private messenger

learning management system

open source software project

ProjectLibre is a project management software company with both a free open-source desktop and a Cloud AI version. ProjectLibre Cloud is a team and Artificial Intelligence solution.

Cytoscape is an open source bioinformatics software platform for visualizing molecular interaction networks and integrating with gene expression profiles and other state data. Additional features are available as plugins. Plugins are available for network and molecular profiling analyses, new layouts, additional file format support and connection with databases and searching in large networks. Plugins may be developed using the Cytoscape open Java software architecture by anyone and plugin community development is encouraged. Cytoscape also has a JavaScript-centric sister project named Cytosca

PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. It runs on Linux, Windows and macOS. It comes in three versions: PDFtk Server (open-source command-line tool), PDFtk Free (freeware) and PDFtk Pro (proprietary paid). It is able to concatenate, shuffle, split and rotate PDF files. It can also show and update metadata. Both CLI and GUI versions of PDFtk are available.

Keycloak is an open-source software product to allow single sign-on with identity and access management aimed at modern applications and services. Until April 2023, this WildFly community project was under the stewardship of Red Hat, who use it as the upstream project for their Red Hat build of Keycloak. In April 2023, Keycloak was donated to the CNCF and joined the foundation as an incubating project.

OCLC-designed persistent identifier scheme

Ontology editor

libGDX is a free and open-source game-development application framework written in the Java programming language with some C and C++ components for performance dependent code. It allows for the development of desktop and mobile games by using the same code base. It is cross-platform, supporting Windows, Linux, macOS, Android, iOS, BlackBerry and web browsers with WebGL support.

java-based document converter

ArgoUML is an UML diagramming application written in Java and released under the open source Eclipse Public License. By virtue of being a Java application, it is available on any platform supported by Java SE.

UltraVNC (sometimes written uVNC) is an open-source remote-administration/remote-desktop-software utility.

db4o (database for objects) was an embeddable open-source object database for Java and .NET developers. It was developed, commercially licensed and supported by Actian. In October 2014, Actian declined to continue to actively pursue and promote the commercial db4o product offering for new customers.

continuous integration server for building Java-based projects

C.a.R. (Compass and Ruler), also known as Z.u.L. (), is a free and open source interactive geometry app that can do geometrical constructions in Euclidean and non-Euclidean geometry. The software is Java based. The author is René Grothmann of the Catholic University of Eichstätt-Ingolstadt. It is licensed under the terms of the GNU General Public License (GPL).

KDE project management application

oVirt is a free, open-source virtualization management platform. It was founded by Red Hat as a community project on which Red Hat Virtualization was based. It allows centralized management of virtual machines, compute, storage and networking resources, from an easy-to-use web-based front-end with platform independent access. KVM on x86-64, PowerPC64 and s390x architecture are the only hypervisors supported, but there is an ongoing effort to support ARM architecture in a future releases.

framework and distributed processing engine for stateful computations over unbounded and bounded data streams

Open Source, cross-platform IM client optimized for businesses and organizations

easy to use, powerful, and reliable open source software to process and distribute data

JFreeChart is an open-source framework for the programming language Java, which allows the creation of a wide variety of both interactive and non-interactive charts.

open-source repository system

system for distributed coordination

Object-Graph Navigation Language (OGNL) is an open-source Expression Language (EL) for Java, which, while using simpler expressions than the full range of those supported by the Java language, allows getting and setting properties (through defined setProperty and getProperty methods, found in JavaBeans), and execution of methods of Java classes. It also allows for simpler array manipulation.

open-source data analytics software

Unified programming model

Kaffe is a discontinued "clean room design" (reverse engineering) version of a Java Virtual Machine. It comes with a subset of the Java Platform, Standard Edition (Java SE), Java API, and tools needed to provide a Java runtime environment. Like most other Free Java virtual machines, Kaffe uses GNU Classpath as its class library.

Openfire (previously known as Wildfire, and Jive Messenger) is an instant messaging (IM) and groupchat server for the Extensible Messaging and Presence Protocol (XMPP). It is written in Java and licensed under the Apache License 2.0.

web application security scanner for penetration tests