OctoPerf - OctoPerf is a SaaS load testing solution, based on JMeter.
Postman - The Collaboration Platform for API Development
WebLOAD - WebLOAD - The most flexible and cost effective software for enterprise load, stress and performance testing, integrated with DevOps processes. Click for details
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
StresStimulus - Load testing tool for websites and mobile that works with hard-to-test applications.
TestComplete - TestComplete Desktop, Web, and Mobile helps you create repeatable and accurate automated tests across multiple devices, platforms, and environments easily and quickly.