Apache Log4j 2 is a versatile, feature-rich, efficient logging API
Advanced Java Redis client for thread-safe sync, async, etc.
The best file downloader library for Android
Asynchronous streaming communication for Clojure
Type-safe HTTP client for Android and Java by Square
An Android library for managing images and the memory they use
Android image loading & caching library focused on smooth scrolling
A production-grade java implementation of RAFT consensus algorithm
Java implementation of RSocket
A Complete Fast Android Networking Library that also supports HTTP/2
LIXA, LIbre XA, is a free and open source XA transaction manager
Cross-platform C++ library for use as a default application framework.
Assorted useful classes
common java utility library
Free Lock Manager
Wraps jCIFS as a java filesystem
Asynchronous socket, http(s) (client+server) and websocket library
HTTP library that makes networking for Android apps
WebSocket & WAMP in Java for Android and Java 8
Lightweight HTTP framework built in Java
Java language binding for the GNU Linear Programming Kit (GLPK)
Demos of Netty 4.x User Guide
webrtc VideoCall VideoConference
Open Utilities and/or Examples for GeneXus