Design patterns implemented in Java

APM, Application Performance Monitoring System

Free and open log management

Traccar GPS Tracking System

High-quality QR Code generator library in Java, TypeScript/JavaScript, Python, Rust, C++, C.

Hackpad is a web-based realtime wiki.

Free Templates for AWS CloudFormation

an open source geocoder for openstreetmap data

The Standard Webhooks specification

Background and foreground geolocation plugin for React Native. Tracks user when app is running in background.

A reference implementation of an event-sourced system that uses PostgreSQL as an event store built with Spring Boot. Fork the repository and use it as a template for your projects. Or clone the rep…

Distributed Stream and Batch Processing

Property-based testing, JUnit-style

Vert.x Blueprint Project - Micro-Shop microservice application

Property based testing for Java 8

Analyze RAW images from a timelapse, and auto - ramp the exposure for manual changes of camera settings. The best way to achieve amazing results in difficult lighting.

An example of implementing hexagonal design in a spring-boot application (A work in progress)