Apache Log4j 2 is a versatile, feature-rich, efficient logging API
An extensible Java library for HTTP request and response logging
A production-grade java implementation of RAFT consensus algorithm
Java distributed tracing implementation compatible with Zipkin backend
A library for debugging android databases and shared preferences
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++