Java opensource projects that need help from community.

1. hate

   1 1 24 3.6 Java

   HATEOAS with HAL for Java (by blackdoor)

   

   https://github.com/blackdoor/hate could use an owner. It already has some production users but I've switched over to focusing on scala and I think this project still has some interesting potential

2. InfluxDB

   www.influxdata.com featured

   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.

   

3. sirix

   2 46 1,158 7.3 Roff

   SirixDB is an an embeddable, bitemporal, append-only database system and event store, storing immutable lightweight snapshots. It keeps the full history of each resource. Every commit stores a space-efficient snapshot through structural sharing. It is log-structured and never overwrites data. SirixDB uses a novel page-level versioning approach.

   

   Append-only database system (based on a persistent inddx structure): https://github.com/sirixdb/sirix or a retargetable query compiler https://github.com/sirixdb/brackit

4. brackit

   3 22 48 6.9 Java

   Query processor with proven optimizations, ready to use for your JSON store to query semi-structured data with JSONiq. Can also be used as an ad-hoc in-memory query processor.

   

   Append-only database system (based on a persistent inddx structure): https://github.com/sirixdb/sirix or a retargetable query compiler https://github.com/sirixdb/brackit

5. UnitsNet

   4 8 2,881 9.1 C#

   Makes life working with units of measurement just a little bit better.

   

   If engineering/scientific projects appeal to you, Units of measurement implementations for Java are woefully behind when compared with the likes of UnitsNet for C#.

6. indriya

   5 2 135 8.5 Java

   JSR 385 - Reference Implementation

   

   JSR 385 reference implementation Indriya - https://github.com/unitsofmeasurement/indriya

7. seshat

   6 3 7 1.0 Java

   Seshat Units of Measurement Implementation (by unitsofmeasurement)

   

   More well developed implementation (with unit simplification) - https://github.com/unitsofmeasurement/seshat

8. boardcad-le

   7 1 23 2.3 Java

   BoardCAD is an easy to use CAD/CAM-program that allows you to quickly design your own surfboards. BoardCAD LE is a fork of the original BoardCAD project where a few things have been removed to make it leaner and easier to maintain.

   

9. Sevalla

   sevalla.com featured

   Deploy and host your apps and databases, now with $50 credit! Sevalla is the PaaS you have been looking for! Advanced deployment pipelines, usage-based pricing, preview apps, templates, human support by developers, and much more!

   

10. penna

    8 6 53 9.1 Java

    Opinionated SLF4J backend that logs natively to json

    

    I'll mention https://github.com/hkupty/penna here as I think it needs more testing and traction...

11. eclipse.platform.swt

    9 3 161 9.8 Java

    Eclipse SWT - The Standard Widget Toolkit

    

    In case someone else wants to contribute to a mature Java library, this one could need some help: https://github.com/eclipse-platform/eclipse.platform.swt

12. skipledger

    10 13 23 7.0 Java

    Differential disclosure solution for maintaining and exposing information from evolving, append-only journals / ledgers.

    

    https://github.com/crums-io/skipledger (a flexible alternative to Merkle trees w/ some interesting applications)

13. io-util

    11 2 0 5.1 Java

    Utility modules, a no-dep JSON module, and a fixed-width external (disk) table module.

    

    Elias Fano encoding improvements for compressed offset files, if you want to get down and dirty https://github.com/crums-io/io-util/blob/master/io-xp/src/main/java/io/crums/io/sef/package-info.java

14. java-excel-utils

    12 1 13 5.8 Java

    This Java library allows you to optimize the work with the Apache POI library. There are wrapper classes and utility classes.

    

    HI,may i suggest you my open source library which manipulates excel files. It uses Apache POI, but tries to give out-of-the-box tools for the user. The project is still in a development phase where I haven't defined many features yet and I'm always looking for many suggestions. Anyone is free to contribute. If you might be interested, here is the link:https://github.com/MBenincasa/java-excel-utils

15. garnet

    13 2 5 8.6 Java

    A free Java based 2D game engine built on LWJGL. (by nickd3000)

    

    That was a great library, I’m writing something similar myself aiming to be as simple and accessible https://github.com/nickd3000/garnet

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