XRebel - XRebel is a lightweight Java profiler that helps developers find and fix common problems in their application as they code.
Dynatrace Load - Dynatrace Load lets you test the performance of web and mobile applications with the realism of load generation from the cloud.
manik-hot-deploy - Manik Hot-Depoy is an eclipse plugin for hot deploy of web applications
Apache JMeter - Apache JMeter™.
HotSwap - Download HotSwap! - Removes devices from Device Manager without putting the data stored on the connected drives in danger, also providing a console-based mode
Sitespeed - Sitespeed.io is an open source tool that helps to analyze and optimize website speed and performance.