Open Source Java Software & Tools

Event-driven workflow orchestration platform with a YAML-based pipeline DSL, 500+ plugins, and a built-in UI editor.

Open-source GPS track manager with 3D topography visualization for outdoor activities.

A community-led fork of Organic Maps. Free offline maps for Android and iOS with no ads, no tracking, and no data collection.

RunnerUp is a free, open source GPS run tracker for Android with audio cues, interval workouts, heart rate zones — no accounts or ads.

A privacy-focused sport tracking application for Android that records GPS tracks and supports Bluetooth sensors without any internet access or ads.

Instant messaging platform with self-hosted backend in Go and clients for iOS, Android, web, and command line.

Free, open source mind mapping and knowledge management desktop app for Windows, macOS and Linux with scripting, LaTeX and add-ons.

Self-hosted personal nutrition tracker with PWA and Android app. No telemetry, no cloud sync, full data ownership.

Open-source wiki platform for teams and enterprises, offering structured content, apps, and custom page development.

A powerful free and open source office suite with word processing, spreadsheets, presentations, and more.

Open source automation tower defense RTS — build factories, mine resources, and defend your core against waves of enemies.

Open source personal finance platform for tracking accounts, transactions, and monthly budgets, with CSV imports. Self-host via Docker or AWS.

Open-source business intelligence tool for dashboards, self-serve analytics, and embedded analytics on top of your company databases.

Free offline maps app for travelers, hikers, and cyclists using OpenStreetMap data. No ads, no tracking.

Self-hosted RSS reader inspired by Google Reader — organize, read and subscribe to your favorite feeds on your own server.

Self-hosted, privacy-first location timeline platform that turns raw GPS data into a searchable history of stays, trips, and movement patterns.

Self-hosted location tracking and analysis with automatic visit detection, trip classification, Immich integration, and multi-user timeline support.