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

Open-Source Subscription Billing & Payments Platform

signal-cli provides an unofficial commandline, JSON-RPC and dbus interface for the Signal messenger.

Very simplified insurance sales system made in a microservices architecture using Micronaut

Castle Mock is a web application that provides the functionality to mock out RESTful APIs and SOAP web services.

Artifact manager implementation for Amazon S3

Simple Kubernetes Operator Using Spring Cloud Gateway and Spring Cloud Kubernetes

OCR REST API using Tesseract OCR Engine (via Tess4J)