• ab – slow and single threaded, written in C
  • apib – most of the features of ApacheBench (ab), also designed as a more modern replacement, written in C
  • baloo – Expressive end-to-end HTTP API testing made easy, written in Go (golang)
  • baton – HTTP load testing, written in Go (golang)
  • bombardier – Fast crossplatform HTTP benchmarking tool, written in Go (golang)
  • curl-loader – performance loading of various application services and traffic generation, written in C
  • drill – Drill is a HTTP load testing application inspired by Ansible syntax, written in Rust
  • fasthttploader – benchmark (kinda ab) with autoadjustment and charts based on fasthttp library, write in Go (golang)
  • fbender – A load-testing command line tool for generic network protocols (HTTP, DNS, DHCP, …), written in Go (golang)
  • fortio – load testing library and command line tool and web UI. Allows to specify a set query-per-second load and record latency histograms and other useful stats, write in Go (golang)
  • gatling – High performance load testing framework based on Scala, Akka and Netty, write in Scala
  • go-wrk – a HTTP benchmarking tool based in spirit on the excellent wrk tool (wg/wrk), write in Go (golang)
  • goad – Goad is an AWS Lambda powered, highly distributed, load testing tool, write in Go (golang)
  • gobench – HTTP/HTTPS load testing and benchmarking tool, write in Go (golang)
  • gohttpbench – ab-like benchmark tool run on multi-core cpu, write in Go (golang)
  • hey – HTTP(S) load generator, ApacheBench (ab) replacement, formerly known as rakyll/boom, written in Go (golang)
  • htstress – multithreading high-load bechmarking services (>5K rps), written in C/Linux
  • httperf – difficult configuration, slow and single threaded, written in C
  • inundator – A simple and high-throughput HTTP flood program, written in C/Linux
  • jmeter – Apache JMeter™, pure application designed to load test performance both on static and dynamic resources, written in Java
  • k6 - A modern load testing tool scriptable in ES6 JS with support for HTTP/1.1, HTTP/2.0 and WebSocket, written in Go (golang)
  • locust – easy-to-use, distributed load testing tool with real-time web UI. Simulates a swarm of concurrent users, the behavior of each of them is defined by your python code. Written in Python
  • mgun – A modern tool for load testing HTTP servers, written in Go (golang)
  • pounce – evented, but results fluctuate, it's sometimes faster than htstress, written in C
  • siege – slow and single threaded, written in C
  • slapper – Simple load testing tool with real-time updated histogram of request timings, written in Go (golang)
  • slow_cooker – A load tester focused on lifecycle issues and long-running tests, service with a predictable load and concurrency level for a long period of time, written in Go (golang)
  • sniper – powerful & high-performance http load tester, written in Go (golang)
  • tsung – Simulate stress users in order to test the scalability and performance of IP based client/server applications HTTP, WebDAV, SOAP, PostgreSQL, MySQL, LDAP and Jabber/XMPP servers, written in Erlang
  • vegeta – HTTP load testing tool and library, written in Go (golang)
  • weighttp – multithreaded, but slower than htstress without keepalive, written in C
  • wrk – multithreaded, but doesn't offer concurrent connections and a keepalive switch, written in C/Lua
  • wrk2 – constant throughput, correct latency recording variant of wrk, written in
  • yandex-tank – Load and performance benchmark tool, written in Python/C|C++|Asm (phantom)