Zipkin is a distributed tracing system

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

Open-Source Web UI for Apache Kafka Management

1️⃣🐝🏎️ The One Billion Row Challenge -- A fun exploration of how quickly 1B rows from a text file can be aggregated with Java

Leading free and open-source face recognition system

Apache Pinot - A realtime distributed OLAP datastore

Distributed Peer-to-Peer Web Search Engine and Intranet Search Appliance

an open source geocoder for openstreetmap data

Flexible tool to build planet-scale vector tilesets from OpenStreetMap data fast

A Graph Traversal Language (no longer active - see Apache TinkerPop)

Perform reverse geocoding locally and offline

Luckysheet java backend

Apache Cassandra® metrics exporter for Prometheus

Enables developers to use AWS Identity and Access Management (IAM) to connect to their Amazon Managed Streaming for Apache Kafka (Amazon MSK) clusters.

Tackling various problems asked in technical interviews

Aiven's S3 Sink Connector for Apache Kafka®