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Mathematical calculators arranged by course topic

Interactive tutoring and adaptive practice in mathematics and coding.

Explanations of mathematics and fundamental science

An interconnected reference for advanced mathematical ideas

Mathematician biographies and historical essays

A browser-based shared math canvas for handwriting, graphs, sliders, and PDF assignments.

A common language for computational mathematics

Symbolic tensor calculations for field-theory problems

Linked mathematical views for algebra, geometry and graphs

Mathematics and practical calculators by subject

Mathematical documents that combine solutions and visualization

Computational queries across mathematics and factual topics

Mathematical and scientific calculators with practical forms

Math and AI architectures worked through by hand

A collaboratively written mathematics encyclopedia

Subject learning across mathematics, sciences and the humanities.

British and world history on HistoryExtra

Campaigns, conflict history and military-history books

Search shell history with command context, and optionally sync it across machines with encryption.

Rewrite Git history to remove paths, extract directories or apply custom filters.

A Mac menu-bar time tracker for freelancers that syncs tracked time with business tools.

Flat-rate team chat for small businesses with channels and unlimited message history.

An interactive browser notebook for mixing executable code, narrative, and rich results in one computational document.

A distraction-free Markdown editor for writing notes as readable documents.