ashishps1 / awesome-system-design-resources

A curated list of free system design learning materials and interview preparation problems and concepts.

apache / kafka

Distributed event streaming platform for building high-throughput data pipelines and streaming applications.

conductor-oss / conductor

Conductor is an event driven agentic workflow engine providing durable and highly resilient execution engine for applications and AI Agents

kestra-io / kestra

Open-source event-driven orchestration platform for scheduling and running data, AI, and infrastructure workflows defined in YAML.

questdb / questdb

QuestDB is a high performance, open-source, time-series database

flowable / flowable-engine

A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users.

jeecgboot / jimureport

一款真正的 AI 报表诞生了！JimuChatBI —— 首款免费开源对话式智能数据分析产品（Chat2BI）。 一句话生成报表和数据大屏，支持对话式 AI 修改优化；类 Excel 在线报表设计，兼容国产信创数据源。 对着 AI 说句话，报表就出来了——表格、图表、分组汇总自动生成，复杂报表场景轻松应对。想做数据大屏？同样一句话搞定，让数据分析进入 AI 时代。

ageerle / ruoyi-ai

Enterprise-grade AI agent framework with multi-provider LLM management, secure knowledge bases and high-precision RAG, visual workflow orchestration, and multi-agent coordination.

doocs / advanced-java

😮 Core Interview Questions & Answers For Experienced Java(Backend) Developers | 互联网 Java 工程师进阶知识完全扫盲：涵盖高并发、分布式、高可用、微服务、海量数据处理等领域知识

PaperMC / Paper

The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies

spinnaker / spinnaker

Spinnaker is an open source, multi-cloud continuous delivery platform for releasing software changes with high velocity and confidence.

HyperXenonZephyr / HyperCore

A high-performance hybrid Minecraft Java server core with mod and plugin compatibility, multi-core scheduling, and experimental GPU acceleration.

ben-manes / caffeine

A high performance caching library for Java

apache / druid

Apache Druid: a high performance real-time analytics database.

Angel-ML / angel

A Flexible and Powerful Parameter Server for large-scale machine learning

aeron-io / simple-binary-encoding

Simple Binary Encoding (SBE) - High Performance Message Codec

apache / gravitino

World's most powerful open data catalog for building a high-performance, geo-distributed and federated metadata lake.

tlaplus / tlaplus

TLC is a model checker for specifications written in TLA+. The TLA+Toolbox is an IDE for TLA+.

itext / itext-java

iText for Java represents the next level of SDKs for developers that want to take advantage of the benefits PDF can bring. Equipped with a better document engine, high and low-level programming capabilities and the ability to create, edit and enhance PDF documents, iText can be a boon to nearly every workflow.

valkey-io / valkey-glide

An open source Valkey client library that supports Valkey, and Redis open source 6.2, 7.0 and 7.2. Valkey GLIDE is designed for reliability, optimized performance, and high-availability, for Valkey and Redis OSS based applications. GLIDE is a multi language client library, written in Rust with programming language bindings, such as Java and Python

apache / incubator-seata

:fire: Seata is an easy-to-use, high-performance, open source distributed transaction solution.

eclipse-vertx / vert.x

Vert.x is a tool-kit for building reactive applications on the JVM

apache / dolphinscheduler

Apache DolphinScheduler is the modern data orchestration platform. Agile to create high performance workflow with low-code

deeplearning4j / deeplearning4j

Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running math code and a java based math library on top of the core c++ library. Also includes samediff: a pytorch/tensorflow like library for running deep learn...

apache / seatunnel

SeaTunnel is a multimodal, high-performance, distributed, massive data integration tool.

checkstyle / checkstyle

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.

google / tsunami-security-scanner

Tsunami is a general purpose network security scanner with an extensible plugin system for detecting high severity vulnerabilities with high confidence.

CaffeineMC / sodium

A high-performance rendering engine replacement for Minecraft, which greatly improves frame rates and reduces micro-stutter

alibaba / fastjson2

🚄 FASTJSON2 is a Java JSON library with excellent performance.

sofastack / sofa-rpc

SOFARPC is a high-performance, high-extensibility, production-level Java RPC framework.

eclipse-openj9 / openj9

Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.

aeron-io / agrona

High Performance data structures and utility methods for Java

apache / hugegraph

A graph database that supports more than 100+ billion data, high performance and scalability (Include OLTP Engine & REST-API & Backends)

opensolon / solon

🔥 Java enterprise application development framework for full scenario: Restrained, Efficient, Open, Ecologicalll!!! 700% higher concurrency 50% memory savings Startup is 10 times faster. Packing 90% smaller; Compatible with java8 ~ java26; Supports LTS. (Replaceable spring)

zeromq / jeromq

JeroMQ is a pure Java implementation of the ZeroMQ messaging library, offering high-performance asynchronous messaging for distributed or concurrent applications.

YeautyYE / netty-websocket-spring-boot-starter

:rocket: lightweight high-performance WebSocket framework （ 轻量级、高性能的WebSocket框架）

controlsfx / controlsfx

High quality UI controls to complement the core JavaFX distribution

aklivity / zilla

🦎 A lightweight, multi-protocol gateway for event-driven applications and AI agents. Expose and govern Kafka, MQTT, APIs, and MCP through one high-performance engine with shared routing, security, schema, and observability.

dingodb / dingo

A multi-modal vector database that supports upserts and vector queries using unified SQL (MySQL-Compatible) on structured and unstructured data, while meeting the requirements of high concurrency and ultra-low latency.

polardb / polardbx-sql

PolarDB-X is a cloud native distributed SQL Database designed for high concurrency, massive storage, complex querying scenarios.

vladmihalcea / high-performance-java-persistence

The High-Performance Java Persistence book and video course code examples

Rosemoe / sora-editor

A multifunctional Android code editor library. (aka CodeEditor)

ongres / stackgres

StackGres Operator, Full Stack PostgreSQL on Kubernetes // !! Mirror repository of https://gitlab.com/ongresinc/stackgres, only accept Merge Requests there.

Netflix / hollow

Hollow is a java library and toolset for disseminating in-memory datasets from a single producer to many consumers for high performance read-only access.

infinispan / infinispan

Infinispan is an open source data grid platform and highly scalable NoSQL cloud data store.

cuba-platform / cuba

CUBA Platform is a high level framework for enterprise applications development

LINBIT / linstor-server

High Performance Software-Defined Block Storage for container, cloud and virtualisation. Fully integrated with Docker, Kubernetes, Openstack, Proxmox etc.

bbottema / simple-java-mail

Simple API, Complex Emails (Jakarta Mail smtp wrapper)

OpenLiberty / open-liberty

Open Liberty is a highly composable, fast to start, dynamic application server runtime environment

bobbylight / RSyntaxTextArea

A syntax highlighting, code folding text editor for Java Swing applications.

hivemq / hivemq-mqtt-client

HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support

apache / celeborn

Apache Celeborn is an elastic and high-performance service for shuffle and spilled data.

ngs-doo / dsl-json

High performance JVM JSON library

carrotsearch / hppc

High Performance Primitive Collections for Java

lucee / Lucee

Lucee is a high-performance, open-source CFML server written in Java. Supporting JDBC, Caching, Parallelism, HTTP, ORM, REST, S3 and dynamic Java integration, Lucee is great for developers aiming to build fast, scalable applications, delivering faster startup, rapid compilation and better runtime performance.

eclipse-vertx / vertx-sql-client

High performance reactive SQL client written in Java

SpaceMadness / lunar-unity-console

High-performance Unity iOS/Android logger built with native platform UI

OpenHFT / Zero-Allocation-Hashing

Zero-allocation hashing for Java

apache / bifromq

Apache BifroMQ (Incubating) is a high-performance, distributed MQTT broker that natively supports multi-tenancy. It is designed to enable the building of large-scale IoT device connectivity and messaging systems.

dromara / easy-query

java/kotlin high performance lightweight solution for jdbc query,support oltp and olap query,一款java下面支持强类型、轻量级、高性能的ORM,致力于解决jdbc查询,拥有对象模型筛选、隐式子查询、隐式join