OpenAPITools / openapi-generator

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

traccar / traccar

Open source GPS tracking platform - self-hosted or managed, 200+ device protocols

swagger-api / swagger-core

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

rest-assured / rest-assured

Java DSL for easy testing of REST services

apache / camel

Apache Camel is an open source integration framework with 350+ connectors. Write routes in Java, YAML, or XML. Run on Spring Boot, Quarkus, or standalone. Apache License 2.0.

discord-jda / JDA

Java wrapper for the popular chat & VOIP service: Discord https://discord.com

apache / linkis

Apache Linkis builds a computation middleware layer to facilitate connection, governance and orchestration between the upper applications and the underlying data engines.

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)

confluentinc / schema-registry

Confluent Schema Registry for Kafka

jonashackt / spring-boot-vuejs

Example project showing how to build a Spring Boot App providing a GUI with Vue.js

Discord4J / Discord4J

Discord4J is a fast, powerful, unopinionated, reactive library to enable quick and easy development of Discord bots for Java, Kotlin, and other JVM languages using the official Discord Bot API.

aws / serverless-java-container

A Java wrapper to run Spring, Spring Boot, Jersey, and other apps inside AWS Lambda.

Endava / cats

CATS is a REST API Fuzzer and negative testing tool for OpenAPI endpoints. CATS automatically generates, runs and reports tests with minimum configuration and no coding effort. Tests are self-healing and do not require maintenance.

codelibs / fess

Open-source, self-hosted enterprise & site search server built on OpenSearch. Crawls web / file / DB / cloud sources, 20+ languages, REST API, and AI/RAG & semantic search. Apache-2.0.

DSpace / DSpace

(Official) The DSpace digital asset management system that powers your Institutional Repository

SoftInstigate / restheart

A backend for web, mobile, AI and IoT apps. Built on MongoDB

restlet / restlet-framework-java

The first REST API framework for Java

spring-petclinic / spring-petclinic-rest

REST version of the Spring Petclinic sample application

AllTick-Official / alltick-realtime-forex-crypto-stock-tick-finance-websocket-api

AllTick real-time financial market data API with REST and WebSocket access to stocks, forex, crypto, commodities, and indices.

xipki / xipki

XiPKI: Compact open source PKI (CA, OCSP responder, certificate protocols ACME, CMP, EST, SCEP), with full support of PQC MLDSA (Dilithium) and MLKEM (Kyber).

Erudika / para

Multitenant backend server for building web and mobile apps rapidly. The backend for busy developers. (self-hosted or hosted)

Aaqibhafeezkhan / Books-API

Spring Boot REST API for searching and discovering books using the Open Library API, with filtering, pagination, and interactive API documentation.