Hacktoberfest is a month-long celebration of open source projects, their maintainers, and the entire community of contributors. Each October, open source maintainers give new contributors extra attention as they guide developers through their first pull requests on GitHub.
JavaScript • Python • Java
Design patterns implemented in Java
All Algorithms implemented in Java
Termux - a terminal emulator application for Android OS extendible by variety of packages.
微信开发 Java SDK ，支持包括微信支付，开放平台，小程序，企业微信，视频号，公众号等的后端开发
Jenkins automation server
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
Apache RocketMQ is a cloud native messaging and streaming platform, making it simple to build event-driven applications.
A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)
QuestDB is an open source time-series database for fast ingest and SQL queries
Quarkus: Supersonic Subatomic Java.
⚡ Workflow Automation Platform. Orchestrate & Schedule code in any language, run anywhere, 500+ plugins. Alternative to Zapier, Rundeck, Camunda, Airflow...
Open source alternative to Auth0 / Firebase Auth / AWS Cognito
The ZAP by Checkmarx Core project
Apache ZooKeeper
Java JWT: JSON Web Token for Java and Android
The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies
Open-Source Web UI for Apache Kafka Management
Views and Drawable for displaying animated GIFs on Android
Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.
Created by DigitalOcean and GitHub
Released October 2014