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

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  • 1
    Facebook BlackBerry SDK
    A Java library for your BlackBerry applications to integrate with Facebook using OAuth 2.0 and Graph API.
    Downloads: 0 This Week
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  • 2
    FancyToast-Android

    FancyToast-Android

    Make your native android Toasts Fancy

    Make your native Android Fantasy Toasts. A library that takes standard Android toast to the next level with a variety of style options. His style of code toast. Make your native Android Fantasy and Gify dialogue. A library that takes the Android dialog standard to the next level with a variety of style options and the GIF of. Your dialogue style from the code. Make your native Fantasy dialogue android. A library that takes the Android dialog standard to the next level with a variety of style options. Your dialogue style from the code. Fantasy Tutorial is a simple and lightweight library that helps you create fresh and beautiful introduction displays for your applications without having to write dozens of lines of code. As its name describes it, it is an Android library that can be used to display badges that react like facebook.
    Downloads: 0 This Week
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  • 3

    Fara

    A rearchitecture for the ActionFixture for the FIT Library

    This project is a small rearchitecture of the FIT Libraries action fixture to avoid bad scaling fixture classes when used with ui testing. Also it provides an adapter for fest testing. There are a few commands implemented yet to use your ui. It is possible that this fit framework do not only grow with ui tests it could be possible to integrate persistence fixture classes.
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  • 4
    Fast Android Networking

    Fast Android Networking

    A Complete Fast Android Networking Library that also supports HTTP/2

    Fast Android Networking Library is a powerful library for doing any type of networking in Android applications which is made on top of OkHttp Networking Layer. Fast Android Networking Library takes care of each and everything. So you don't have to do anything, just make a request and listen for the response. The recent removal of HttpClient in Android Marshmallow(Android M) made other networking libraries obsolete. No other single library does and everything like making requests, downloading any type of file, uploading file, loading images from the network in ImageView, etc. There are some libraries but they are outdated. No other library provides a simple interface for doing all types of things in networking like setting priority, canceling, etc. As it uses Okio , No more GC overhead in android applications. Okio is made to handle GC overhead while allocating memory. Okio does some clever things to save CPU and memory.
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    Fast Matrix for Java

    General purpose matrix utilities for Java in Parallel Computing

    Fast Matrix for Java (fm4j) is a general-purpose matrix utility library for computing with dense matrices. fm4j encapsulated different underlying implementations and select the optimal one in run-time depending on the size of the input matrix. Moreover, fm4j employs Java (Tm) Concurrency to take advantage of the computation power of multi-cor processors.
    Downloads: 0 This Week
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  • 6

    FenixSped

    Integração com Webservers do Projeto Sped, NFSe e GNRE

    Projeto inclui serviços da nota fiscal eletronica nacional, notas fiscais eletrônicas de serviços e GNRE. Pode ser utilizado como biblioteca com funções prontas ou chamar via linha de comandos para assinatura digital, validações e comunicações com webservices. NFe 3.10 NFSe Abrasf, DSF e ISS.NET GNRE-PE
    Downloads: 0 This Week
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  • 7
    File System Crawler for Elasticsearch

    File System Crawler for Elasticsearch

    Elasticsearch File System Crawler (FS Crawler)

    This crawler helps to index binary documents such as PDF, Open Office, MS Office. Local file system (or a mounted drive) crawling and indexing new files, updating existing ones, and removing old ones. Remote file system over SSH/FTP crawling. REST interface to let you “upload” your binary documents to elastic search.
    Downloads: 0 This Week
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  • 8
    File-Security-SDK

    File-Security-SDK

    EaseFilter Comprehensive File Security SDK

    The EaseFilter Filter Driver SDK is a collection of tools, libraries, and sample code designed to facilitate the creation of Windows file system filter drivers. These drivers operate at a low level, intercepting file I/O requests before they reach the underlying file system or other filter drivers. The EaseFilter SDK provides a powerful interface for developing Windows filter drivers in C++, C#, or other programming languages that support native DLL calls. This guide helps developers understand how to use the SDK effectively to monitor, filter, or control file system activities in real time.
    Downloads: 0 This Week
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  • 9
    Provides a Java programmable only text file editor. No gui is available. It supplies most of the features you expect from an editor including selections.
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  • 10
    FileMonitorExample

    FileMonitorExample

    EaseFilter File Monitor Filter Driver SDK

    A file system filter driver intercepts requests directed at a file system or another filter driver. By capturing these requests before they reach their intended targets, the filter driver can extend or modify the functionality provided by the original target. Windows offers file system filtering services through the Filter Manager, which provides a framework for developing file systems and filter drivers without delving into the complexities of file I/O operations. EaseFilter Filter Driver SDK can monitor Windows file I/O activities in real time, track the file access and changes, monitor file and folder permission changes, audit who is writing, deleting, moving or reading files, report the user name and process name, get the user name and the ip address when the Windows file server's file is accessed by network user.
    Downloads: 0 This Week
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  • 11
    A framework for doing asynchronous socket communications - useful for connecting to a large number of hosts in parallel from a single thread. Builds on top of Java NIO library and hides all socket, buffer details.
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  • 12

    Flaat

    A new GUI development framework

    This project aims to develop a new GUI design experience with platform independent "Look and Feel". The aim of a this project is to develop a java library which shall be able to use with any type of software developed in java.
    Downloads: 0 This Week
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  • 13
    FlexGen is a flexible random map generation library for games and simulations. Maps are generated by randomly laying down map tiles so that their edges match. You can define map tiles however you want to determine what type of map is created.
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  • 14
    FlexibleParser_Java

    FlexibleParser_Java

    Group of multi-purpose Java-converted-from-C# parsing libraries.

    FlexibleParser (Java) is currently formed by the following independent libraries/parts: - UnitParser. It allows to easily deal with a wide variety of situations involving units of measurement. - NumberParser. It provides a common framework for all the .NET numeric types. AUTHORSHIP & COPYRIGHT I, Alvaro Carballo Garcia (varocarbas), am the sole author of each single bit of this code. All the contents of this repository can be considered public domain. For more information about my copyright/authorship attribution ideas, visit https://customsolvers.com/copyright/. IMPORTANT NOTE This project is a mirror of the repository FlexibleParser_Java in my GitHub account (varocarbas). Both versions are fully synchronised and immediately updated with any change.
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  • 15
    FolderLockerExample

    FolderLockerExample

    EaseFilter Folder Locker Example

    EaseFilter Folder Locker is a Windows file and folder protection solution built on the EaseFilter File Control, Encryption and Process Filter Driver SDK. It lets you lock, hide, and restrict access to files and folders in real time to prevent unauthorized access or modification. With the folder locker you can prevent your protected files being read,written,deleted, renamed, copied out of the protected folder, allow you to authorize or deny the file access to specific user or process, also allow you to hide the files or automatically encrypt/decrypt the files
    Downloads: 0 This Week
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  • 16
    Friendly Object-Oriented Game Library , 2D Java Game Engine based on Slick2D and LWJGL. This library was designed for students and primer Java programmer.
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  • 17

    Format-Preserving Encryption

    Format-Preserving Encryption Library for Java

    This package implements the FF1, FF3, and FFX algorithms and the A2 and A10 parameter sets for format-preserving encryption. The FF1 and FF3 methods for format-preserving encryption are implementations of NIST Special Publication 800-38G, Recommendation for Block Cipher Modes of Operation: Methods for Format-Preserving Encryption. The FFX algorithm and A2 and A10 parameter sets are implementations of "The FFX Mode of Operation for Format-Preserving Encryption," by Mihir Bellare, Phillip Rogaway, and Terence Spies. For more information see the README.txt and package-info.java files in the source.
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  • 18
    FormulaOneSDK is a open source project which provides low level SDK including FormulaOneCommon Project, FormulaOneConcurrent Project, FormulaOneGUI Project, FormulaOneJ2EE Project, FormulaOneLog Project and FormulaOneThread Project to other projects.
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  • 19

    Fox Junior Java Utils

    Java utils I created

    When writing projects I collected some of my utils into library to speed up developement. So, I decided to share those. See my home page for more information. See more at my blog http://www.foxjunior.eu/tiny-web-server/ http://www.foxjunior.eu/java-image-utils/ http://www.foxjunior.eu/java-formatters/ http://www.foxjunior.eu/java-assertion-e/ http://www.foxjunior.eu/java-reflection-e/
    Downloads: 0 This Week
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  • 20
    Fragmentation

    Fragmentation

    A powerful library to manage fragmentation on Android

    Fragmentation is a powerful library managing Fragment for Android. It is designed for "Single Activity + Multi-Fragments" and "Multi-FragmentActivities + Multi-Fragments" architecture to simplify development processes. Develop complicated nested fragment apps rapidly. Use fragment's stack view dialog to debug easily. Add launch mode, startForResult etc. to provide similar behavior of Activity. Add onBackPressedSupport() method to support back button press monitoring in Fragment. Add onSupportVisible(), onLazyInitView() to simplify dev. Easily manage Fragment transition animations. Simplify the communication between Fragment(EventBusActivityScope module). Added a queue mechanism to completely solve the Fragment multi-touch and extreme transaction problems, and improve stability (at the same time, a new post(Runnable)method is added to allow your custom tasks to be queued).
    Downloads: 0 This Week
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  • 21
    Generic libraries and modules contributed by Freepath
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  • 22
    Fresco

    Fresco

    An Android library for managing images and the memory they use

    Fresco’s image pipeline will load images from the network, local storage, or local resources. To save data and CPU, it has three levels of cache; two in memory and another in internal storage. Fresco’s Drawee shows a placeholder for you until the image has loaded and then automatically shows the image when it arrives. When the image goes off-screen, it automatically releases its memory. A decompressed image - an Android Bitmap - takes up a lot of memory. This leads to more frequent runs of the Java garbage collector. This slows apps down. The problem is especially bad without the improvements to the garbage collector made in Android 5.0. On Android 4.x and lower, Fresco puts images in a special region of Android memory. It also makes sure that images are automatically released from memory when they’re no longer shown on screen. This lets your application run faster - and suffer fewer crashes.
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  • 23
    Frodo

    Frodo

    Android Library for Logging RxJava Observables and Subscribers

    Frodo is an Android debugging library for logging RxJava Observable and Subscriber behavior directly to Logcat. It uses annotations to identify reactive methods and classes that should be instrumented. A Gradle plugin generates and weaves the required logging code only into debug builds, allowing annotations to remain safely in production source. Observable logging can report emitted values, execution time, schedulers, and lifecycle events. Configurable scopes let developers choose how much information each annotated stream should expose. Subscriber annotations provide similar visibility into values and callbacks received from Observables. The project targets the original RxJava API and has known limitations with Android library modules.
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  • 24
    From Java To Kotlin

    From Java To Kotlin

    Your Cheat Sheet For Java To Kotlin

    From Java to Kotlin is a practical guide for Android developers transitioning existing codebases and habits from Java to idiomatic Kotlin. Rather than simply showing syntax translations, it emphasizes Kotlin’s expressive features—null safety, extensions, data classes, sealed hierarchies, and higher-order functions—and how to apply them sensibly. Examples illustrate side-by-side Java and Kotlin snippets, revealing opportunities to reduce boilerplate and improve readability. The guide includes best practices for coroutine usage, collection operations, and scoping functions that make asynchronous and functional patterns feel natural. It also discusses interoperability and migration strategies so mixed-language projects remain stable during the transition. The result is a concise playbook that helps teams adopt Kotlin with confidence, writing safer and more maintainable code without losing touch with the underlying platform.
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  • 25
    GQLx is a SQL-like query language for Google Doc's spreadsheets. The initial release includes both a Java GUI application as well as a console application - while a demonstration Javascript implementation is available online at http://gqlx.twyst.co.za
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