bgpview.io
Internet intelligence tool for looking up ASN details, IP information, and BGP routing data.
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centralops.net
Collection of online network tools for DNS, IP lookup, email checks, and security research.
gnunet.org
GNUnet is GNU's framework for secure peer-to-peer networking. It is described as a network protocol stack for building secure, distributed and privacy-preserving applications, aiming to replace the existing Internet protocol stack, and is free software.