Open Source Java Software & Tools

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

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

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

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

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

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

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

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

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.

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.

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

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

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

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