la4j (Linear Algebra for Java) is an open source and 100% Java library that provides Linear Algebra primitives (matrices and vectors) and algorithms. The la4j library was initially designed to be a lightweight and simple tool for passionate Java developers. It has been started as student project and turned into one of the most popular Java packages for matrices and vectors.

la4j - Linear Algebra for Java

Eclipse JNoSQL is a Java framework that streamlines the integration of Java applications with NoSQL databases. It defines a set of APIs and provides a standard implementation for most NoSQL databases. This clearly helps to achieve very low coupling with the underlying NoSQL technologies used in applications.
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It provide a set of APIs that defines communication with NoSQL databases. Compared with traditional the RDBMS world, they are like the JDBC API. It contains four modules, one for each NoSQL database type: Key-Value, Column Family, Document, and Graph.

Eclipse JNoSQL is a Java framework that streamlines the integration of Java applications with NoSQL databases. It defines a set of APIs and provides a standard implementation for most NoSQL databases. This clearly helps to achieve very low coupling with the underlying NoSQL technologies used in applications.

Eclipse JNoSQL - Framework which has the goal to help Java developers to create Jakarta EE applications with NoSQL

MOE is a system for synchronizing, translating, and scrubbing source code repositories. Often, a project needs to exist in two forms, typically because it is released in open-source, which may use a different build system, only be a subset of the wider project, etc. Maintaining code in two repositories is burdensome. 

MOE - Make Opensource Easy - tools for synchronizing repositories

OrsonPDF is a PDF generation library for the Java(tm) platform that allows you to create content in PDF format using the standard Java2D drawing API (Graphics2D). OrsonPDF is light-weight, fast, and has no dependencies other than the Java runtime (1.6 or later).

OrsonPDF - A fast, lightweight PDF generator for the Java platform

Strongbox is a modern OSS artifact repository manager. With a well-developed architecture, it provides native implementations for various layout formats, such as Maven, NPM, NuGet, and Raw.

Strongbox - Artifact repository manager.

Saker.build is a language agnostic build system that focuses on extensibility and scalable incremental builds. It supports distributing build tasks over multiple build machines, rebuilding only the smallest possible part of the project, and can scale for tens of thousands of source files. Saker.build can be used to build project of any languages. From Java through C++, it can be used to create applications of any type. The different types can be even mixed in a single project.
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Saker.build uses its own scripting language for defining the build process and loads the build tasks from the configured task repositories. It integrates well with the Eclipse IDE and provides unmatched performance for Java builds.



Saker.build is a language agnostic build system that focuses on extensibility and scalable incremental builds. It supports distributing build tasks over multiple build machines, rebuilding only the smallest possible part of the project, and can scale for tens of thousands of source files. Saker.build can be used to build project of any languages. From Java through C++, it can be used to create applications of any type. The different types can be even mixed in a single project.

Saker.build - A modern build system focusing on fast and incremental builds for all project sizes

Technical analysis library with indicators like ADX, MACD, RSI, Stochastic, TRIX... This is not an end-user GUI trading or charting application. It is instead targeted to application developers using either Excel, .NET, Mono, Java, Perl, Python or C/C++.

TA-Lib- Technical Analysis Library

JQuantLib is a comprehensive framework for quantitative finance, written in 100% Java. It provides "quants" and Java application developers several mathematical and statistical tools needed for the valuation of shares, options, futures, swaps, and other financial instruments. JQuantLib is based on QuantLib, a well known open-source library for quantitative finance, written in C++. JQuantLib aims to be a complete rewrite of QuantLib, offering features Java developers expect to find. It aims to be fast, correct, strongly typed, well-documented, and user-friendly.

JQuantLib - Comprehensive framework for quantitative finance

lodsve is the short of Let our development of Spring very easy!. My development tools, it encapsulates some open source projects, and better facilitate the conduct of Java Web development. It consists of modules like Cache management, Dependencies Management, Aws, DataSource for RDBMS, Search component(solr/lucene), Authentication and certification For Spring MVC, WeChat SDK and lot more.

Lodsve Framework - Let our development of Spring very easy!

Apicurio Registry is an API/Schema registry - stores and retrieves APIs and Schemas. 

Apicurio Registry - An API/Schema registry - stores and retrieves APIs and Schemas

Snow Owl is a highly scalable, open source terminology server with revision-control capabilities and collaborative authoring platform features. It allows you to store, search and author high volumes of terminology artifacts quickly and efficiently. It can maintain multiple versions (including unpublished and published) for each terminology artifact and provides APIs to access them all. It provides Full SNOMED CT terminology support.

Snow Owl - Scalable, open source terminology server (SNOMED CT, ICD-10, LOINC, dm+d, ATC and others)

JsonDB is a pure java database that stores its data as Json Files. A very small memory footprint, runs embedded within your java program. It provides APIs that are very similar and similar to MongoDB. It supports encryption of data, XPath based search/find queries.






JsonDB - A pure java database that stores its data as Json Files

Spincast is a framework to serve as a backend for Single Page Applications (SPA), to develop old-school HTML generated websites or to be a REST API services platform. Spincast aims to feel more like a library than like a framework. It is not opinionated and favors configuration over convention. Its main goal is to give power to the developers. 

Spincast is an highly flexible and open source Java web framework, based on Guice

jBatchEngine is a batch job spooler written in Java. It is event driven. Currently a DatabaseAdapter provides job spooling But it could be extended by writting own Adapter for Jobmanagement. Simply implement the Adapter Interface and configure it in the Spring configuration.

jBatchEngine is a batch job spooler written in Java. It is event driven.

jBatchEngine

A Java library that keeps OAuth 2.0 service access tokens in memory for your usage.
    

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

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