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Free Japanese grammar guides with examples and explanations.

AI writing assistant that edits inside Google Docs using native Suggestions.

Language model API toolkit for grammar, autocomplete, AI detection and rephrasing

Printable reading, spelling, grammar and writing resources with subject and grade browsing.

Free AI writer for paraphrasing, rewriting, and grammar correction.

English dictionary lookup with grammar and usage material

A Windows Python IDE pairing a script editor with an interpreter, debugger, project tools and unit-test interface.

Construct rate curves and inspect fixed-income price sensitivities

A writing workspace for notes, outlines, mind maps, and AI help.

AI English tutor for speaking practice with real-time feedback

AI feedback and band estimation for IELTS Academic and General Training writing tasks

AI writing assistant for Mac and Windows that works in any app

Email delivery diagnostics with guided or managed fixes

Jupyter-native AI agent that writes, runs, and debugs Python in notebooks.

Swedish podcasts, lessons and pronunciation practice.

Language modules you can study in a chosen order.

AI speaking practice for English and 35+ languages

AI tutor for English speaking practice with instant feedback

Reading, listening, dictation and grammar practice across languages.

Italian exercises arranged by level.

AI writing, homework and research tools with a free daily credit plan.

Interactive Icelandic built around life in Iceland.

English explanations and exercises indexed by topic and level.

Detailed German grammar and vocabulary explanations.