ABC Tools - Online calculators and simulators.

ABC Tools is a collection of 700+ free browser-based calculators and utilities across 20+ categories:
statistics, math, finance, betting odds, sports, science, engineering, health, image editing, text and data
conversion, developer tools, SEO, simulations, games, and more.
Every tool runs instantly with no signup, no install, and no paywall. Most calculators come with a
wiki-style guide explaining the underlying method.