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inspectIT is the leading Open Source APM (Application Performance Management) tool for analyzing your Java (EE) applications.

Autonomous Performance Tuning for Kubernetes!

Samples for "Hibernate performance tuning" talk

Another repo for jamonapi.com which is primarily hosted on sourceforge

Android application to participate in experiment crowdsourcing (such as workload crowd-benchmarking and crowd-tuning) using Collective Knowledge Framework and open repositories of knowledge:

Frontcache - page fragment cache designed to boost web app performance. It reduces server response time for dynamic pages, reduces load on backend systems multiple times, increases application's resilience. Works as Servlet Filter or Standalone Cache Server.

DEPRECATED StackImpact Java Profiler - Production-Grade Performance Profiler: CPU, locks, runtime metrics, and more

A Generic Benchmarking Platform for Big Data Architectures

Detect, analyse and prevent the memory leaks on Java based applications.

A tool to tune/validate/monitor performance of Azure Cosmos DB collections via Mongo Protocol.

Example of performance tuning Hazelcast object serialization to get faster read's and writes from the distributed in-memory data grid.

Catla for Hadoop and Spark (Catla-HS): An open-source system to support tuning MapReduce performance on Hadoop and Spark clusters.

Database and JVM tuning techniques.

A maintained fork of MobStacker2, a highly efficient, customizable and easy to use plugin for lifting entity stress from your server.