MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
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MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.
- mock-server
- proxy
- java-client
- javascript-client
Desktop app for managing BibTeX and BibLaTeX (.bib) libraries
- jabref
- bibtex
- java
- latex
The missing bridge between Java and native C++
- javacpp
- java
- c
- cpp
Android virtual machine and deobfuscator
- deobfuscation
- java
- optimization
- android
Roadmap to becoming a Java developer in 2026
- java
- jee
- roadmap
- guidelines
Azkaban workflow manager.
- workflow-engine
- azkaban
- scheduling
- hacktoberfest
Decompiler from Java bytecode to Java, used in IntelliJ IDEA.
- java
- decompiler
- reverse-engineering
A complete 3-D game development suite written in Java.
- jmonkeyengine3
- jmonkeyengine
- java
- hacktoberfest
Agentic Orchestration Platform
- microservices
- orchestration-framework
- workflow-engine
- java
Java bytecode engineering toolkit
- java-bytecode
- java
Distributed Peer-to-Peer Web Search Engine and Intranet Search Appliance
Code as configuration. Annotate a Java entity with @Erupt and ship a production-grade admin backend in minutes — UI, RBAC, audit logs and APIs, all generated at runtime. No codegen, no frontend.
- annotation
- erupt
- low-code
- mdd
Terasology - open source voxel world
Micro second messaging that stores everything to disk
- chronicle
- queue
- java
- performance
🗺️ Minecraft map editor and mod
- worldedit
- java
- minecraft
- forge
Apache Linkis builds a computation middleware layer to facilitate connection, governance and orchestration between the upper applications and the underlying data engines.
A graph database that supports more than 100+ billion data, high performance and scalability (Include OLTP Engine & REST-API & Backends)
- database
- graph-database
- graph
- gremlin
Manifold is a Java compiler plugin, its features include Metaprogramming, Properties, Extension Methods, Operator Overloading, Templates, a Preprocessor, and more.
- java
- intellij
- json
- template-engine
Apache Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log-like data
- flume
- java
- apache
- api
Security engine for Java (authentication, authorization, multi frameworks): OpenID Connect, SAML2, CAS, OAuth, LDAP, JWT...
Apache ActiveMQ
- activemq
- java
- amqp
- amqps
JeroMQ is a pure Java implementation of the ZeroMQ messaging library, offering high-performance asynchronous messaging for distributed or concurrent applications.
- jeromq
- libzmq
- messaging
- networking
The SpotBugs plugin for security audits of Java web applications and Android applications. (Also work with Kotlin, Groovy and Scala projects)
- findbugs
- java
- security-audit
- owasp