Improve your musical skills in a fun and challenging way.

Helps you and your friends/business partners to better organize your spare time/business meetings.

See how your position in Google shapes visibility in ChatGPT, Claude, Gemini, and Perplexity.

Helps groups of people find the best time for all of them to meet up.

See where your passport gets you visa-free, eVisa, on arrival, or visa-required.

Helps you "do the math" quickly in areas such as finance, fitness, health, math, and others.

Provides free online network tools and utilities, including SilverBench - multicore benchmarking.

This adventures bring you to South America, Egypt, Schwarzendumpf Castle and a mysterious Missile Base.

Shows the assembly output of compiled C++, Rust, Go (and many more) code.

A set of online editors and code execution results viewers: HTML, JSON, XML, CSS, JavaScript.