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A high performance caching library for Java
QuestDB is a high performance, open-source, time-series database
Apache Druid: a high performance real-time analytics database.
Admin UI for administration of spring boot applications
A Java API for generating .java source files.
Resilience4j is a fault tolerance library designed for Java8 and functional programming
A simple expressive web framework for java. Spark has a kotlin DSL https://github.com/perwendel/spark-kotlin
Asynchronous Http and WebSocket Client library for Java
Thumbnailator - a thumbnail generation library for Java
MockServer enables easy mocking of any system you integrate with via HTTP or HTTPS with clients written in Java, JavaScript and Ruby. MockServer also includes a proxy that introspects all proxied t…
Micro second messaging that stores everything to disk
AI constraint solver in Java to optimize the vehicle routing problem, employee rostering, task assignment, maintenance scheduling, conference scheduling and other planning problems.
Replicate your Key Value Store across your network, with consistency, persistance and performance.
Manifold is a Java compiler plugin, its features include Metaprogramming, Properties, Extension Methods, Operator Overloading, Templates, a Preprocessor, and more.
The Hypersistence Utils library (previously known as Hibernate Types) gives you Spring and Hibernate utilities that can help you get the most out of your data access layer.
Java unlimited redefinition of classes at runtime.
XML/XHTML and CSS 2.1 renderer in pure Java
KeyStore Explorer is a free GUI replacement for the Java command-line utilities keytool and jarsigner.
JSON to JSON transformation library written in Java.
Libraries to help developers express architectural abstractions in Java code