Cap is a free, open-source, self-hosted CAPTCHA alternative. It uses proof-of-work and JavaScript instrumentation challenges instead of visual puzzles, and is licensed under Apache 2.0. It is installed by running a server with Docker and adding a widget to a form.
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A web-based tool that tests the IPv6 readiness of an internet domain and shows whether the visitor's own connection supports IPv6. It reports DNS-based results, including nameserver and mail exchanger records, and maintains a Hall of Fame of domains scoring five stars. It also warns when an embedded MAC-address identifies the device. The site requires JavaScript.
A browser-based tool that calculates primes, encrypts messages with the RSA algorithm and brute-forces decryption of RSA messages given a public key. All primes between 0 and 0 are stored in JavaScript files, and additional primes can be generated and kept until the page reloads.
Test IPv6 tests a browser and connection for IPv6 readiness and shows the current IPv4 and IPv6 address. The site requires JavaScript and the ability to pull in cross-site scripts to perform the testing. A simple test offers a quick pass/fail for IPv4, IPv4+IPv6, and IPv6, but provides little diagnostic information.