freepublicapis.com
FreePublicAPIs is a developer tool, library, or framework for building, testing, or maintaining software.
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globster.xyz
Globster is an online tool for testing and visualizing results of glob patterns matching. Users type a glob pattern and matched files are highlighted in the tree directory structure. It uses version 3.0.4 of the minimatch JavaScript library to evaluate glob patterns. It is intended for debugging glob patterns and experimenting with provided examples.
grafana.com
Grafana is an open-source platform for querying, visualizing and understanding data. Grafana Labs documents a core stack covering metrics, logs and traces across Grafana OSS, Grafana Cloud and Grafana Enterprise, alongside observability, AI, testing and incident response documentation.
gtmetrix.com
GTmetrix checks page speed, performance, technical issues, and web quality signals.
gohugo.io
Hugo is a developer tool, library, or framework for building, testing, or maintaining software.
insomnia.rest
Insomnia is an open-source collaborative API development platform. It supports HTTP, REST, GraphQL, gRPC, SOAP, and WebSockets, and offers AI-native API design, testing, mocking, and debugging features. Users can store data locally, via Git, or in the cloud. The platform has a free tier, paid plans, and integrates with Kong Konnect.
jsoning.com
jsoning is a developer tool, library, or framework for building, testing, or maintaining software.
microlink.io
Microlink SDK is a developer tool, library, or framework for building, testing, or maintaining software.
nullphpscript.com
Null PHP Script is a developer tool, library, or framework for building, testing, or maintaining software.
onlinegdb.com
Online Python Compiler is a developer tool, library, or framework for building, testing, or maintaining software.
phpbb.com
PHPBB is a developer tool, library, or framework for building, testing, or maintaining software.
tools.pingdom.com
Pingdom's free Website Speed Test analyzes a webpage's load time and identifies bottlenecks. A full page test breaks requests into stages such as DNS lookup, SSL handshake, connect, send, wait, receive and blocked, and flags redirects and 4xx or 5xx responses. Pingdom also offers uptime and performance monitoring from more than 70 global polling locations.
pinging.net
Pinging.net is a web tool for testing and monitoring an internet connection. It reports status for HTTP, DNS, WebRTC and the browser, and shows web ping statistics including last, minimum, maximum and average values and packet loss, with updates every 30 seconds.
playwright.dev
A web automation and testing framework for apps, scripts, and AI agents. It offers a test runner with auto-waiting and assertions, browser automation across Chromium, Firefox, and WebKit, and a Model Context Protocol server for AI agents.
publicapis.io
PublicAPIs is a developer tool, library, or framework for building, testing, or maintaining software.
developer.mozilla.org
Regex Syntax Cheatsheet is a developer tool, library, or framework for building, testing, or maintaining software.
replay.io
Replay QA is an autonomous testing harness for web applications. Agents explore an app, write and run tests in a Chromium browser, and record deterministic runtime sessions. It reports bugs such as runtime bugs, UI glitches, accessibility issues, performance problems and security vulnerabilities, with a root cause and suggested fix. Reports go to GitHub, Linear, Jira or other HTTP endpoints.
resttesttest.com
A simple web page for testing APIs. Users specify an HTTP method, URL and parameters and click to send an Ajax request. The page requires a browser with HTML5 support.
storybook.js.org
Storybook is a frontend workshop for building UI components and pages in isolation. It helps developers develop and share hard-to-reach states and edge cases without running the whole app, and supports UI development, testing and documentation. It is open source and free.
vim.org
vim-pathogen is a developer tool, library, or framework for building, testing, or maintaining software.