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Top 15 Java Foss Projects
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Just learning about OpenSearch. Looks like it's a fork of Elasticsearch from 2021 when Elasticsearch changed licensing model. https://github.com/opensearch-project/OpenSearch
Anyone know if it's still a drop in replacement for Elasticsearch? And how does it compare on performance and features?
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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OpenBoard
100% foss keyboard based on AOSP, with no dependency on Google binaries, that respects your privacy.
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Shelter
A Free and Open-Source (FOSS) app that leverages the "Work Profile" feature of Android to provide an isolated space that you can install or clone apps into.
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Project mention: Kafbat UI – Resurrected Kafka UI from the Original Core Team | news.ycombinator.com | 2025-04-15
We brought Kafbat UI back to life — a clean, modern UI for Apache Kafka (kafka-ui), originally built by the core team that created the widely used Kafka tools you may have seen before.
Key features:
Built by the original maintainers
Instant cluster introspection and topic browsing
Zero-config local startup (Docker support included)
Actively maintained & open source
GitHub: https://github.com/kafbat/kafka-ui
We’d love your feedback and contributions — let’s build the Kafka UI we all wanted back.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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awips2
Weather forecasting display and analysis package developed by NWS/Raytheon, released as open source software by Unidata.
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MumbleLink
Minecraft + Mumble + MumbleLink = You hear where voices come from and how far away they are! This is a Minecraft mod based on "Minecraft Forge". It's purpose is to be able to use Minecraft in conjunction with Mumble's positional audio feature (http://mumble.sourceforge.net/).
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Then it would also show up in the nice oss LavSeeker app: https://github.com/woheller69/lavatories
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10-bitClockWidget
10-bit Clock Widget uses 10 binary dots and their color to represent current time in 12-hour format.
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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 Foss discussion
Java Foss related posts
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OpenSearch 3.0 Released
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OpenSearch vs. Elasticsearch: Why OpenSearch is the Better Choice for AWS Users
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F-Droid, Keyboard Libraries, and Choosing a Browser
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Why Android developers no longer need Windows USB drivers
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Can apps send your data if it hasnt got network permissions?
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⟳ 3 apps added, 10 updated at apt.izzysoft.de
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⟳ 0 apps added, 1 updated at fdroid.typeblog.net
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A note from our sponsor - InfluxDB
www.influxdata.com | 14 May 2025
Index
What are some of the best open-source Foss projects in Java? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | OpenSearch | 10,605 |
| 2 | OpenBoard | 2,638 |
| 3 | Shelter | 2,558 |
| 4 | kafka-ui | 1,059 |
| 5 | personalDNSfilter | 723 |
| 6 | android | 674 |
| 7 | android-ocr | 473 |
| 8 | Clock | 451 |
| 9 | LibreAV | 270 |
| 10 | awips2 | 190 |
| 11 | MumbleLink | 109 |
| 12 | openinwa | 93 |
| 13 | lavatories | 93 |
| 14 | new-clock | 80 |
| 15 | 10-bitClockWidget | 48 |
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