Blazemeter - BlazeMeter is a self- service performance load testing cloud tool
OctoPerf - OctoPerf is a SaaS load testing solution, based on JMeter.
flood.io - Load Testing for Everyone
StresStimulus - Load testing tool for websites and mobile that works with hard-to-test applications.
Loader.io - Loader.io is a simple cloud-based load testing service
SmartMeter.io - Performance Testing with Enterprise-Level Features with a familiar jMeter interface