Apache Log4j 2 is a versatile, feature-rich, efficient logging API
A library for debugging android databases and shared preferences
A production-grade java implementation of RAFT consensus algorithm
An extensible Java library for HTTP request and response logging
Java distributed tracing implementation compatible with Zipkin backend
An assorted miscellany of tools and toys.
Single sided linked list (kind of lib with test-code, C, C++ and java)
Common classes for Java developers needed by most projects.
jsoniter (json-iterator) is fast and flexible JSON parser
Cassandra Log4j 2 Appender library
jchart2d is a real-time charting library written in java.
Crash report for Android apps
Library tools to collect timing in Java, C, C++