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Author readable keyword-driven acceptance tests and run them from the command line with structured result reports.

Independent TOEFL and TOEIC preparation with online practice, guides and sample tests.

Statistical calculations with method-selection guidance

Browser-based statistics from pasted data

Focused statistics tools for research calculations

Web and network diagnostics grouped in one toolbox

Study price charts with scanning and system-testing tools

Cloud learning and certification preparation with courses, practice tests and hands-on labs.

AI survey simulation that builds virtual audiences and returns simulated feedback.

Free online form builder for teams with unlimited responses

Campaign editing and automated flows with contact-based subscriptions

AI testing platform for web, mobile, API and desktop QA

Run Ruby acceptance scenarios written in Gherkin and connect their steps to project code.

Online coding assessment platform for AI and ML engineering roles

Agentic development platform with an app, CLI, IDE, and SDK for building with agents.

Coding agent that builds, tests, and demos software features.

Newsletter publishing with separate web, email and audience settings

Research studies and a shared findings repository

Community coding kata with tests and solution comparisons

Moderated and unmoderated studies across the design cycle

Norwegian consumer-technology tests, news and guides

Detailed Korean lessons from reading basics to advanced grammar.

Build a working interpreter step by step in Go

Inspect regular expressions visually