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

  • Custom VMs From 1 to 96 vCPUs With 99.95% Uptime Icon
    Custom VMs From 1 to 96 vCPUs With 99.95% Uptime

    General-purpose, compute-optimized, or GPU/TPU-accelerated. Built to your exact specs.

    Live migration and automatic failover keep workloads online through maintenance. One free e2-micro VM every month.
    Try Free
  • $300 in Free Credit Towards Top Cloud Services Icon
    $300 in Free Credit Towards Top Cloud Services

    Build VMs, containers, AI, databases, storage—all in one place.

    Start your project in minutes. After credits run out, 20+ products include free monthly usage. Only pay when you're ready to scale.
    Get Started
  • 1
    Fully playable Java game demo illustrating basic game programming technics, such as sprite animation, pixmap fonts, time or frame related game loop, affine transformations, convolution filters, sound generation and playback...
    Downloads: 0 This Week
    Last Update:
    See Project
  • 2
    a framework library with a template method interface and inheritable classes for an executable process design which produces an executable which is both a GUI and a console application. It provides multi-threading for work items of the provider process .
    Downloads: 0 This Week
    Last Update:
    See Project
  • 3
    a sandbox for trying my engine ideas
    Downloads: 0 This Week
    Last Update:
    See Project
  • 4
    Java implementation of A* algorithm, that could be used in Roguelike games.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Gemini 3 and 200+ AI Models on One Platform Icon
    Gemini 3 and 200+ AI Models on One Platform

    Access Google's best plus Claude, Llama, and Gemma. Fine-tune and deploy from one console.

    Build generative AI apps with Vertex AI. Switch between models without switching platforms.
    Start Free
  • 5
    ACMgen is an automatic code generator of Asynchronous Communications Mechanisms based on the generation of Petri nets models that can be formally verified against some properties and then transformed into a real implementation (e.g. C++ or Verilog).
    Downloads: 0 This Week
    Last Update:
    See Project
  • 6

    ADiV

    ADiV is a set of components for LAMW that uses JAVA and Pascal

    ADiV is a set of components for LAMW that uses JAVA and Pascal. It stands out for the simplicity of programming, thanks to the use of Pascal and hiding the Java Android code.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    All pairs shortest path implementation using iterative mapreduce paradigm. Specifically, the iterative paradigm is an implementation of Twister (www.iterativemapreduce.org), developed by Indiana University.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    Aggressive Rectangle Truncation (ART) with Location Verfication Mechanism is a localization algorithm in wireless sensor networks written in nesC.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    A Java implementation of a cubic B-spline curve smoothing function. Allows an arbitary number of points with a variable number of dimensions to have a cubic B-spline curve "fitted". Useful in finance for analysing bond or swap yield and discount curves.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Add Two Lines of Code. Get Full APM. Icon
    Add Two Lines of Code. Get Full APM.

    AppSignal installs in minutes and auto-configures dashboards, alerts, and error tracking.

    Works out of the box for Rails, Django, Express, Phoenix, and more. Monitoring exceptions and performance in no time.
    Start Free
  • 10
    Agenda desenvolvida em Java, utilizando banco PostGreSQL. Itens: Cadastro de Contatos Cadastro de Tarefas
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11
    AhoCorasickDoubleArrayTrie

    AhoCorasickDoubleArrayTrie

    An extremely fast implementation of Aho Corasick algorithm

    AhoCorasickDoubleArrayTrie is a Java implementation of the Aho–Corasick multi-pattern matching algorithm that is optimized using a Double-Array Trie data structure. It is designed for fast keyword scanning across large texts, where you want to search for many patterns simultaneously and efficiently. The core idea is to build an automaton from a dictionary of patterns, then stream through input text to emit matches with minimal overhead. By using a double-array trie representation, the project emphasizes performance and memory efficiency compared to simpler pointer-heavy trie structures, which can matter a lot for large dictionaries or latency-sensitive services. This makes it a strong fit for tasks like content filtering, entity/term spotting, dictionary-based annotation, or high-throughput log/text processing. In short, it’s a specialized, speed-focused library for industrial-strength multi-keyword matching in Java.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    Aleph is both a multi-platform machine learning framework aimed at simplicity and performance, and a library of selected state-of-the-art algorithms.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13

    AlgART Java Libraries

    Open source library for processing arrays and matrices

    AlgART Java libraries for processing arrays and matrices are open-source product, distributed under MIT license. So, anyone can use them for free without any restrictions. Main features: 63-bit addressing of array elements (64-bit long int indexes), memory model concept (allowing storing data in different schemes from RAM to mapped disk files), wide usage of lazy evaluations, built-in multithreading optimization for multi-core processors, wide set of image processing algorithms over matrices, etc. - please see at the site. Almost all classes and methods are thoroughly documented via JavaDoc (you may read full JavaDoc at the site).
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    AlgoExplorer is a dynamic data structures viewer for Java. It allows the visualization of data structure of a Java program, allowing you to see how objects, handled by the algorithms, interact with each other and how they are related and linked. The project has been moved on: http://code.google.com/p/algoexplorer/
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15

    Algorithm Database

    Efficient Algorithms implemented in Java

    The Aim of this project is to provide a collection of reusable Algorithms which can be used effectively in different scenarios. Algorithm implementations are in Java. Objective here is to implement algorithms which should be more efficient than the JDK implementation and also to create a platform for the researchers who works on Data Mining, Encryption algorithms, ect.. to collaborate and contribute to this project.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    The goal: to provide implementations of as many algorithms (sorting, searching, ...) and data structures (lists, trees, ...) as possible, accompanied by discussion of big O run time and memory limits and references to sources of further study.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    The Gene Expression Programming Framework in Java. It separates the process of evolution from the process of interpretation of the chromosome, allowing the use of various schemes in the chromosome.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    A complete library of high-speed java collection classes to complement existing classes with new and advanced algorithms. Complements standard J2SE classes and Jakarta commons classes
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    The main goal of the Analytical Customer Relationship Management system is to improve services provided to customers, and to use customer contact information for targeted marketing.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    Animal-AV

    Animal-AV

    Animal Algorithm Animation System

    Animal is a Java-based system for visualizing and animating algorithms and data structures. Available since 1999, it is one of the established AV systems, and provides one of the largest collections of supported algorithms. Animations can be generated on the fly based on user input - for a large selection of algorithms and topic areas, including, but not limited to, the topic areas of backtracking algorithms, compression, cryptography, basing, searching and sorting.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21

    Approximate Subgraph Matching Algorithm

    Approximate Subgraph Matching Algorithm for Dependency Graphs

    The subgraph matching problem (subgraph isomorphism) is NP-complete. Previously, we designed an exact subgraph matching (ESM) algorithm for dependency graphs using a backtracking approach (http://esmalgorithm.sourceforge.net). We further designed an approximate subgraph matching (ASM) algorithm that is capable of detecting approximate subgraph matching based on a subgraph distance. Assume that the graph G and the subgraph Gs have m and n vertices, and km and kn edges respectively, the total worst-case algorithm complexity is O(m^n * n(n-1)/2 * km * log m). This Java implementation implements our ASM algorithm. See README file: https://sourceforge.net/projects/asmalgorithm/files/ If you use our ASM implementation to support academic research, please cite the following paper: Haibin Liu, Lawrence Hunter, Vlado Keselj, and Karin Verspoor. Approximate Subgraph Matching-based Literature Mining for Biomedical Events and Relations. PLOS ONE, 8:4 e60954, 2013.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    Test of Artificial Life
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Toolbox for Java developers. Includes right now only a multi-layered extensible cache system but will grow depending on requirements.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    Awakener aims to provide a Java library for solving practical, real world optimisation problems by means of genetic algorithms (turnkey algorithms for >= 90% of industry problems). Awakener extends Sleepwalker with specific algorithms.
    Downloads: 0 This Week
    Last Update:
    See Project
MongoDB Logo MongoDB