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Google tool for building, testing, and experimenting with Gemini prompts, models, and API workflows.

Google Lighthouse checks page speed, performance, technical issues, and web quality signals.

Gothub helps developers write, search, review, test, or manage code and projects.

GrackerAI helps audit websites, improve search visibility, and monitor SEO or analytics performance.

Grid My Business helps monitor local SEO visibility, map rankings, business listings, and local search performance.

GTmetrix checks page speed, performance, technical issues, and web quality signals.

Guide (Important) helps developers write, search, review, test, or manage code and projects.

Browse research datasets and measurement and test data related to analytical chemistry.

Hashatit helps audit websites, improve search visibility, and monitor SEO or analytics performance.

HaystackEditor helps developers write, search, review, test, or manage code and projects.

OSINT.sh SSL check for testing whether a host appears vulnerable to Heartbleed.

Helix helps developers write, search, review, test, or manage code and projects.

HEPData

hepdata.net

Searchable repository for finding chemical solid state and surface datasets and measurement and test data.

Hermes Agent

hermes-agent.nousresearch.com

Hermes Agent helps build, test, automate, or manage AI agents, prompts, models, and API workflows.

horsicq helps developers write, search, review, test, or manage code and projects.

Hover.CSS helps developers write, search, review, test, or manage code and projects.

How To Turn off IPv6 helps developers write, search, review, test, or manage code and projects.

Online HTML editor for writing, testing, and previewing web markup directly in the browser.

Tool for cleaning unsafe HTML and testing sanitized output for safer web content handling.

HTTPStatus

httpstatus.io

HTTP redirect checker for testing status codes, redirect chains, and response headers.

Hugo is a developer tool, library, or framework for building, testing, or maintaining software.

Icon Shelf helps developers write, search, review, test, or manage code and projects.

Ideone helps developers write, search, review, test, or manage code and projects.

Image to HTML Code Demo

huggingface.co

Supports software work with AI-assisted coding, testing or application development.