“I have enough trouble with useful information, never mind being burdened with what is useless.”
― Erlend Loe, Naïve. Super

Collection of open-source tools for debugging, benchmarking, load and stress testing your code or services.

NOTE: Unfortunately I've found this original awesome collection too late: awesome-http-benchmark.
Feel free to follow and contribute to it instead of this collection, which remains my personal variation and working copy.

In alphabetical order.

• Debugging & API testing
• Benchmarking & load testing
• DoS/DDoS penetration testing
• Traffic replay
• Latency simulation

• baloo - Expressive and versatile end-to-end HTTP API testing made easy in Go.
• bat - A curl-like tool for humans, inspired by httpie, written in Go.
• curl - A command line tool and library for transferring data with URL syntax. C
• curlie - The power of curl, the ease of use of httpie. Go
• curlx - Supercharge curl with history, collections and more. JavaScript
• hitt - File based HTTP testing tool focused on speed and simplicity. Rust
• hopp-cli - An HTTP CLI client for hoppscotch, an alternative to curl, httpie. Go
• httpcat - A simple utility for constructing raw HTTP requests on the command line. Python
• httpie - Modern command line HTTP client, user-friendly curl alternative with intuitive UI, JSON support, syntax highlighting, wget-like downloads, extensions, etc. Python
• httpie-go - httpie-like HTTP client written in Go.
• httping - A ping-like utility for HTTP requests. C
• httpstat - curl statistics visualization in a way of beauty and clarity. Python
• hurl - A command line tool to perform HTTP requests defined in a simple plain text format. Rust
• wuzz - Interactive command line tool for HTTP inspection. Go
• xh – Yet another httpie clone in Rust.

• ab - ApacheBench, single-threaded Apache HTTP server benchmarking tool. C
• ali - A load testing tool capable of performing real-time analysis, inspired by vegeta, written in Go.
• apachebench-ab - Standalone version of ab, Apache HTTP server benchmarking tool. C
• apib - A simple, fast HTTP and API benchmarking tool. C++
• autocannon - Fast HTTP/1.1 benchmarking tool written in Node.js, greatly inspired by wrk and wrk2, with support for HTTP pipelining and HTTPS.
• ballast - A simple API load testing tool to compare performance snapshots of your API. Rust
• baton - HTTP load testing written in Go.
• beast - Stress testing for RESTful APIs. Go
• beeswithmachineguns - An utility for arming (creating) many bees (micro EC2 instances) to attack (load test) targets (web applications). Python
• benchttp - HTTP server benchmarking tool, implements the most commonly used features of ab. Go
• bender - An easy-to-use library for creating load testing applications. Go
• bfg - A modular tool and framework for load generation with HTTP/2 support. Python
• blast - A simple, protocol agnostic tool for API load testing and batch jobs. Go
• bombardier - Fast cross-platform HTTP benchmarking tool written in Go.
• boom - A replacement for ab, written in Python.
• carrot - Distributed WebSocket and HTTP load testing framework in Go.
• cassowary - Modern cross-platform HTTP load testing tool written in Go.
• chaperon - HTTP service performance & load testing framework. Elixir
• clobbr - A tool to check the speed and resilience of API endpoints against multiple parallel or sequence requests. JavaScript
• curl-loader - A load generating tool written in C, simulating HTTP/S, FTP/S and TLS/SSL clients each with own IP-address.
• drill - A HTTP load testing application, written in Rust, inspired by Ansible syntax.
• encarno - Load generator for HTTP with high throughput and high precision. Go
• f1 - A flexible load testing framework using Go for test scenarios.
• fasthttploader - HTTP benchmark (kinda ab) with autoadjustment and charts based on fasthttp library. Go
• fbender - A load testing command line tool for generic network protocols, originally based on bender library. Go
• fortio - Load testing library, command line tool, advanced echo server and web UI in Go.
• freeloader - Super easy load testing framework, with load scenarios in JavaScript.
• go-meter - A HTTP benchmark tool written in Go.
• go-wrk - A small heavy duty HTTP/S benchmark tool, similar to wrk, but written in Go.
• goad - An AWS Lambda powered, highly distributed, load testing tool. Go
• gobench - HTTP/S load testing and benchmarking tool. Go
• gocannon - A lightweight HTTP benchmarking tool, intended to measure changes in backend application performance over time. Go
• gohttpbench - An ab-like benchmark tool run on multi-core cpu. Go
• goku - HTTP load testing application written in Rust.
• goku-bench - An HTTP load testing tool built out of a need to drill HTTP services inspired by drill and vegeta. Rust
• goose - A Rust load testing tool inspired by locust.
• gopayloader - HTTP/S benchmark/load testing cross-platform tool with optional JWT generation, inspired by bombardier. Go
• goperf - Go based load tester with a simple intuitive command line syntax.
• hargo - Go library and command line utility that parses HAR files, can convert to curl format, and serve as a load test driver.
• hey - HTTP load generator, ab replacement. Go
• htstress - Fast HTTP benchmarking tool, similar to ab but provides multithreading support. C
• http_bench - An HTTP(/1/2/3) and WebSockets stress testing tool, with both single and distributed modes. Go
• httperf - A tool for measuring web server performance. C
• httpit - A rapid HTTP/S benchmark tool, written in Go.
• httpress - High performance HTTP server stress & benchmark utility, inspired by weighttp. C
• hulken - Stress testing tool for everything speaking HTTP. JavaScript
• hurl - HTTP server load test and parallel curl utilities. C++
• iago2 - A load generator, built for engineers. Scala
• jbender - A port of bender to the JVM platform with Quasar lightweight threads (fibers) and channels. Java
• jetty-load-generator - An API for load testing HTTP servers, based on Jetty's HttpClient and Java 11+.
• legion - A JavaScript-based load testing tool for HTTP servers and other kinds of software.
• loadtest - A JavaScript package for load testing with HTTP/S and WebSockets support and API for easy integration.
• loadtesttoolbox - Lightweight tools for load testing web applications, written in C#.
• mgun - A modern tool for load testing HTTP servers, written in Go.
• minigun - Simple Kubernetes native HTTP benchmark tool, written in Go.
• molotov - Simple Python 3.7+ tool to write load tests.
• nbomber - Very simple load testing framework for Pull and Push scenarios, written in F# and targeting .NET Core and full .NET Framework.
• netling - Load testing client for easy web testing. C#
• node-ab - A command line tool to test the performance of HTTP services. Node.js
• node-vegeta - Node.js bindings for the vegeta load testing library.
• oha - HTTP load generator, inspired by hey with tui animation. Rust
• pandora - A load generator in Go, with built-in HTTP/S and HTTP/2 support and load scenarios in Go.
• pewpew - Flexible HTTP command line stress tester for websites and web services. Go
• plow - A high-performance HTTP benchmarking tool with real-time web UI and terminal displaying. Go
• ponos - Simple yet powerful load generator written in Erlang.
• pounce – HTTP benchmark utility, written in C.
• pronk - A small command line application for load testing web servers. Haskell
• reqstress - A benchmarking & stressing tool that can send raw HTTP requests, written in Go.
• rewrk - A modern HTTP framework benchmarking utility supporting HTTP/1 and HTTP/2 benchmarks. Rust
• salvo - Like boom, but based on molotov. Python
• sb - SuperBenchmarker, ApacheBench (ab) on steroids. C#
• siege - A HTTP load tester and benchmarking utility. C
• slapper - Simple load testing tool with real-time updated histogram of request timings. Go
• slow_cooker - A load tester focused on lifecycle issues and long-running tests. Go
• sniper - Powerful and high-performance HTTP load tester, written in Go.
• stress - Simple Node.js tool for stress testing HTTP services.
• terjang - Scalable HTTP load testing tool built on vegeta. Go
• thrash - Go HTTP micro benchmarker.
• vegeta - HTTP load testing tool and library. Go
• vex - A small PHP app that sends some load to a web application.
• weighttp - A lightweight and simple webserver benchmarking tool. C
• welle - An ab-like benchmarking tool written in Rust.
• wrk - Modern HTTP benchmarking tool. C
• wrk2 - A constant throughput, correct latency recording variant of wrk. C

• amoc - A simple framework for running massively parallel XMPP tests in a distributed environment. Erlang
• bench - A generic latency benchmarking library. Go
• bomberman - SMTP performance and load testing tool. Go
• dhammer - DHCP stress tester and benchmark tool. Go
• massive-attack - Load testing Thrift, made simple. Scala
• rpc-perf - A tool for benchmarking RPC services. Rust
• rtmp_load - A load testing tool for RTMP servers. C
• srs-bench - A HTTP/RTMP/HLS load testing and benchmarking tool. C++
• ssh-hammer - A SSH load testing tool. Go
• tcpkali - Fast multi-core TCP and WebSockets load generator. C

• dnsblast - A DNS performance testing utility. Go
• dnsblast - A simple and stupid load testing tool for DNS resolvers. C
• dnsmeter - A tool for testing performance of nameservers and the infrastructure around it. C++
• dnsperf - DNS performance testing tools. C
• dnstress - A DNS stress testing tool. C
• flamethrower - A DNS performance and functional testing utility, originally built as an alternative to dnsperf. C++

• ghz - Simple gRPC benchmarking and load testing tool. Go
• strest-grpc - A load tester for stress testing gRPC intermediaries. Go

• kafka-stress - CLI tool to stress Apache Kafka clusters. Go
• sangrenel - Apache Kafka load testing. Go

• emqtt-bench - A simple MQTT v5.0 benchmark tool written in Erlang.
• flotilla - Automated message queue orchestration for scaled-up benchmarking. Go
• mqperf - A benchmark of message queues with data replication and at-least-once delivery guarantees. Scala
• mqtt-benchmark - A simple MQTT (broker) benchmarking tool. Go
• mqtt-stresser - Load testing tool to stress MQTT message broker. Go
• mqttloader - Load testing tool for MQTT, capable of benchmark test for both MQTT v5.0 and v3.1.1 brokers. Java
• mqttwrk - A wrk/wrk2-inspired tool for scale and performance testing MQTT brokers. Rust
• rabbitmq-perf-test - RabbitMQ performance testing tool. Java

• artillery - A modern load and functional testing toolkit written in Node.js, with test scenario scripting in JavaScript.
• ddosify - High-performance load testing and DDOS attack simulation tool, written in Go.
• gatling - A load and performance testing framework based on Scala, Akka and Netty.
• grinder - A distributed load testing framework written in Java, with test scenario scripting in Jython and Clojure.
• jagger - An open-source framework for Continuous Performance Testing written in Java.
• jmeter - A Java tool designed to load test functional behavior and measure performance of a variety of services, with a focus on web applications.
• k6 - A modern load testing tool, using Go and JavaScript.
• locust - Scalable distributed load testing tool written in Python.
• multi-mechanize - Performance and load testing framework written in Python.
• mzbench - Expressive, scalable load testing tool, with multiple protocols support. Erlang
• ngrinder - Enterprise level performance testing solution based on The Grinder. Java
• predator - A distributed open-source platform for load testing APIs using custom version of artillery as load testing engine. Node.js
• tank - A cloud native load testing platform. Java
• tsung - A multi-protocol distributed load testing tool, developed in Erlang.
• yandex-tank - An extendable load testing tool which is especially good as a part of an automated load testing suite. Python, C

• memtier_benchmark - A high-throughput benchmarking tool for Redis & Memcached. C++
• redisbench - Redis & Redis cluster benchmarking tool. Go

• go-ycsb - A Go port of Yahoo! Cloud Serving Benchmark (YCSB). Go
• ndbench - Netflix Data Store Benchmark, a pluggable cloud-enabled benchmarking tool that can be used across any data store system. Java
• ycsb - Yahoo! Cloud Serving Benchmark (YCSB), a framework and common set of workloads for evaluating the performance of different "key-value" and "cloud" serving stores. Java

• diskspd - A storage performance testing tool from the Windows, Windows Server and Cloud Server Infrastructure engineering teams at Microsoft. C++
• fio - Flexible I/O tester. C
• ioarena - Embedded storage benchmarking tool. C

• cosbench - A benchmark tool for cloud object storage service. Java
• gosbench - Distributed S3 performance benchmark tool with Prometheus exporter, Go reimplementation of cosbench.
• mongoose - Distributed storage performance testing tool. Java
• os-benchmark - Handy tool for object storage performance benchmarking. Python
• ostorebench - A benchmark tool for distributed object storage systems. Go
• s3-benchmark - S3 benchmarking tool. Go
• warp - S3 benchmarking tool. Go

• prometheus-benchmark - Benchmark for Prometheus-compatible systems on production-like workload. Go
• tsbs - Time Series Benchmark Suite, a tool for comparing and evaluating databases for time series data. Go

• k8s-bench-suite - Simple scripts to benchmark Kubernetes cluster features. Shell
• k8s-netperf - Running networking performance tests against Kubernetes. Go
• k-bench - Workload benchmark for Kubernetes. Go
• kboom - The Kubernetes scale & soak load tester, equivalent of boom, written in Go.
• kube-burner - A tool aimed at stressing Kubernetes clusters by creating or deleting a high quantity of objects. Go
• kubestr - A collection of tools to discover, validate and evaluate Kubernetes storage options. Go
• perf-tests - Kubernetes-related performance testing tools and benchmarks. Go

• easygraphql-load-tester - A Node.js library created to make load testing on GraphQL based on the schema.
• graphql-bench - A versatile tool for benchmarking and load testing GraphQL services, as a CLI application or via programmatic API. TSQL

• caliper - A blockchain benchmark framework to measure performance of multiple blockchain solutions. JavaScript
• gohammer - A blockchain test tool designed to get performance metrics of the nodes and operation system by deploying a smart contract and calling smart contract's methods. Go

For educational and security/stress testing (as part of development) purposes only.

• finshir - A coroutines-driven Low & Slow traffic sender, written in Rust.
• golden-eye - HTTP DoS test tool using HTTP Keep Alive + NoCache as attack vector. Python
• goloris - Slowloris implementation for nginx DoS written in Go.
• hulk - Original HULK web server DoS attack tool ported to Go with some additional features.
• hulk-v3 - Python 3 compatible async HULK script for DDoS attacks.
• lor-axe - A multi-threaded, low-bandwidth HTTP DoS tool, written in Rust.
• rip - An HTTP load testing and UDP flood attack tool. Go
• slowhttptest - A highly configurable application layer DoS attack simulator. C++
• slowloris - Low bandwidth DoS tool, rewrite in Python.
• wreckuests - Yet another one hard-hitting tool to run DDoS attacks with HTTP-flood. Python

• goreplay - A network monitoring tool which can record live traffic, and use it for shadowing, load testing, monitoring and detailed analysis. Go
• ripley - HTTP traffic replay tool at multiples of the original rate. Go
• shadowreader - Serverless load testing tool for replaying website traffic by collecting traffic patterns from access logs, powered by AWS Lambda, S3 and ELB. Python
• tcpcopy - A TCP stream replay tool to support real testing of server applications. C

• clumsy - Makes your network condition on Windows significantly worse, but in a controlled and interactive manner. C
• comcast - A tool designed to simulate common network problems like latency, bandwidth restrictions, and dropped/reordered/corrupted packets. Go
• speedbump - A TCP proxy for simulating variable, yet predictable network latency. Go
• toxiproxy - A TCP proxy to simulate network and system conditions for chaos and resiliency testing. Go

Contributions are welcome!
Read the CONTRIBUTING guidelines first.