Proxy tester tool : Allows testing HTTP\Socks5 proxies and shows results like IP, p0f, latency, DNS leaks, UDP, WebRTC etc.
p0f test, IPv4 : Shows OS TCP fingerprint and some parameters of TCP connection.
DNS leak test : Tests DNS leak.
HTTP/3.0 QUIC/UDP test : Tests whether your browser supports HTTP/3.0 (QUIC) and therefore is UDP capable.