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Learn System Design concepts and prepare for interviews using free resources.
Open Source Identity and Access Management For Modern Applications and Services
Apache Kafka - A distributed event streaming platform
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
A Java serialization/deserialization library to convert Java Objects into JSON and back
Awesome LeetCode resources to learn Data Structures and Algorithms and prepare for Coding Interviews.
Most popular Mocking framework for unit tests written in Java
Very spicy additions to the Java programming language.
A scalable web crawler framework for Java.
LangChain4j is an open-source Java library that simplifies the integration of LLMs into Java applications through a unified API, providing access to popular LLMs and vector databases. It makes impl…
Flyway by Redgate • Database Migrations Made Easy.
Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.
An annotation processor for generating type-safe bean mappers
✅ The programmer-friendly testing framework for Java and the JVM
Non-Blocking Reactive Foundation for the JVM
Solutions to LeetCode problems; updated daily. Subscribe to my YouTube channel for more.
Framework for Evolutionary Message-Driven Microservices on the JVM
Contains latest company wise questions of LeetCode as of Feb 2026.
High Performance data structures and utility methods for Java
Ultra-fast matching engine written in Java based on LMAX Disruptor, Eclipse Collections, Real Logic Agrona, OpenHFT, LZ4 Java, and Adaptive Radix Trees.
We do Open Source ERP - Fast, Flexible & Free Software to scale your Business.
Elasticsearch File System Crawler (FS Crawler)
A game server reimplementation for a certain turn-based anime game
A modern, lambda-friendly, 120 character Java formatter.
An example of Choreography-based sagas in Spring Boot/JPA microservices
UUID Creator is a Java library for generating Universally Unique Identifiers. It generates all standard identifiers from UUIDv1 to UUIDv7. It also provides an alternative to the classic JDK's UUID …