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Top 23 Java Cross-Platform Projects
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Project mention: MonoGame: A .NET framework for making cross-platform games | news.ycombinator.com | 2026-03-07
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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Codename One
Open-source framework for native apps from one Java codebase, with a custom-rendered UI you control across iOS, Android, desktop, web, and watches.
Project mention: UWB and Nearby Devices: Distance, Direction, Association, and Transport | dev.to | 2026-09-06That last clause is part of the API contract. Nearby hardware gives partial answers, permissions change by operating-system version, and Apple's local transport cannot discover Google's. PR #5589 exposes those boundaries through three packages under com.codename1.nearby.
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minecraft-world-downloader
Download Minecraft worlds, extend server's render distance. 1.12.2 - 1.21
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weblaf
WebLaF is a fully open-source Look & Feel and component library written in pure Java for cross-platform desktop Swing applications.
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Kargo
Stop Scripting Promotions. Start Shipping with Kargo. Kargo automates promotion across dev, staging, and prod with approval gates and verification. Open source, built by the team behind Argo CD. Download now.
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jdeb
This library provides an Ant task and a Maven plugin to create Debian packages from Java builds in a truly cross platform manner.
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ReplicaDB
ReplicaDB is open source tool for database replication, designed for efficiently transferring bulk data between relational and non-relational databases
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SystemTray
Cross-platform SystemTray support for Swing/AWT, macOS, GtkStatusIcon, and AppIndicator on Java 8+
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webfx
A JavaFX application transpiler. Write your Web Application in JavaFX and WebFX will transpile it in pure JS.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Java Cross-Platform discussion
Java Cross-Platform related posts
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UWB and Nearby Devices: Distance, Direction, Association, and Transport
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Put App Documents in the System File Browser
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One App, More Than One Native Window
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App Intents: One Java Declaration for Siri, Spotlight, and Shortcuts
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CodeScanner.scan(): Barcode Scanning Without Rebuilding the Camera Pipeline
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Tapjacking Protection: Rejecting Android Touches Behind an Overlay
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One Java API for HomeKit, Matter, and Google Home
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A note from our sponsor - Kargo
akuity.io | 8 Sep 2026
Index
What are some of the best open-source Cross-Platform projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | libGDX | 25,371 |
| 2 | Small | 5,025 |
| 3 | Codename One | 1,863 |
| 4 | minecraft-world-downloader | 1,521 |
| 5 | mucommander | 1,269 |
| 6 | weblaf | 1,173 |
| 7 | radiance | 907 |
| 8 | colfer | 759 |
| 9 | capacitor-plugins | 678 |
| 10 | jpsxdec | 599 |
| 11 | jdeb | 542 |
| 12 | JColor | 514 |
| 13 | ReplicaDB | 496 |
| 14 | SystemTray | 495 |
| 15 | HyperLap2D | 442 |
| 16 | webfx | 402 |
| 17 | ShareX | 293 |
| 18 | client | 290 |
| 19 | jatatui | 285 |
| 20 | wayang | 274 |
| 21 | Pixelitor | 263 |
| 22 | server | 254 |
| 23 | shapedrawer | 202 |
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