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Mathematical calculators arranged by course topic

Room-mode calculations for rectangular and shaped rooms

Customize PDF output from URLs or raw HTML through an API

Render paginated HTML into PDF with a command-line workflow

Adjust and retouch photos in a browser

Computational algebra and number-theory software

A browsable mathematical reference organized by subject

Mathematical calculators organized by learning topic

Mathematical solvers alongside lessons and formulas

Interactive beam, frame and truss analysis

Edit and convert geographic datasets in a browser or terminal

Command-line vector-data conversion and transformation

Preview a 3D model before exporting another format

Command-line PDF validation, page layout, and resource tools

Assemble virtual brick models with connection and collision controls

Symbolic, numerical and number-theory calculators