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A JavaScript testing framework with readable behavior-driven specs and a Node command-line workflow.

Medical video lectures and linked USMLE-style question practice in a browser-based platform.

Build interactive terminal applications in Go with an event-driven model, update, and view loop.

An independent practice-exam catalogue for school, college and professional tests.

Interactive piano practice with video and sheet music.

AI language tutor for speaking, listening, writing, and pronunciation practice in 130+ languages.

Independent GMAT preparation with question practice, learning feedback, analytics and mocks.

English exam practice with mock tests, AI feedback, vocabulary tools and personalised study plans.

Edit code with a fast desktop editor whose multiple selections can apply the same change in several places.

Build event-driven applications with a cross-platform asynchronous I/O library.

Maintain event-driven Python backtests with the Zipline research model

A modal, configurable text editor for programming and general text work.

Build reusable implicit models and prepare geometry for engineering tools

Render data-driven text and HTML from reusable templates with Python-inspired syntax.

Coding practice grouped by technical skill

Official SAT and PSAT preparation with full-length tests, targeted questions and study-planning guidance.

ATI's TEAS preparation resources, including SmartPrep study, practice assessments and mobile options.

Online test preparation with separate routes for admissions and English-language exams.

Study an exploratory Python engine for historical equities tests

Control Chrome or Firefox from JavaScript to automate browser workflows and exercise web pages.

Prompt management for product teams to build, test, and deploy AI prompts.

Teacher-certification preparation organised by US state and test series.

UPSC coaching with live online classes, recordings, digital study material and test series.

Practice resources for a broad catalogue of professional and certification exams.