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LAN, Wi-Fi and Internet diagnostics on a phone

A web stack for publishers and brands to manage AI agent access.

Generate and replay traffic for controlled network tests

See a website from several geographic browser locations

Test multicast reachability with a sender and reflector

Simulate systematic portfolios with detailed trade and risk reports

Regex lessons beside a cheatsheet and playground

Chip-design, manufacturing and packaging analysis

Generate font pairings in one click

Programming contests with a permanent practice entry point

A topic-organized collection of programming tutorials

Java and Spring tutorials organized by technology