Java opensource projects that need help from community.

• hate

  1 21 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

• sirix

  44 1,079 9.2 Java

  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

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

• brackit

  21 46 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

• UnitsNet

  8 2,128 8.6 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#.

• indriya

  2 110 7.6 Java

  JSR 385 - Reference Implementation

  

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

• seshat

  3 5 1.0 Java

  Seshat Units of Measurement Implementation (by unitsofmeasurement)

  

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

• boardcad-le

  1 17 2.2 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.

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• penna

  6 39 9.5 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...

• eclipse.platform.swt

  2 91 9.5 Java

  Eclipse SWT (by eclipse-platform)

  

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

• skipledger

  13 19 4.0 Java

  Differential privacy 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)

• io-util

  2 0 3.8 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

• java-excel-utils

  1 11 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

• garnet

  2 3 7.9 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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