A modern I/O API for Java
Okio 1.4.0 API
MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.
MapDB: Database Engine — MapDB
Twitter4J is an open-sourced, mavenized and Google App Engine safe Java library for the Twitter API which is released under the Apache License 2.0.
Twitter4J - A Java library for the Twitter API
Java HTTP Request Library
http-request http-request : java http request library
Backport of Java 8's lambda expressions to Java 7, 6 and 5
Tiny, easily embeddable HTTP server in Java.
NanoHttpd-Project –
A Java API for generating .java source files.
The Java driver for MongoDB
MongoDB Java Driver
A supplement or replacement for the Java Collections Framework.
A modern JSON library for Android and Java.