Yandex.Tank is an extendable open source load testing tool for advanced linux users which is especially good as a part of automated load testing suit.
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Pro Modular architecture
Yandex.Tank has modular plugin-based architecture, so it will be easy to extend it for your needs.
Pro Yandex.Tank supports different load generators
You can use different load generators with Yandex.Tank. The default option is 'phantom' (C++), you can also use JMeter.
Pro Static html report
There is an html report plugin that generates a report with interactive JS-based charts.
Pro External timeline storages support
Yandex.Tank supports uploading your test data to Graphite or InfluxDB.
Pro Test auto stop
You can stop your test automatically on different conditions.
Pro HTTP API server.
There is an HTTP API server for Yandex.Tank that allows you to manage your tanks over the network.