The one I use the most is probably <a href="https://developer-toolchest.com" rel="nofollow noreferrer">https://developer-toolchest.com</a>
I wrote a program that waits for a socket response. When I reboot a vm, I use it to know when I can ssh in:<p><a href="https://github.com/brianmed/SocketFun/tree/main/socketwait">https://github.com/brianmed/SocketFun/tree/main/socketwait</a><p>socketwait 192.168.1.10 22 --waitFor TcpRegexResponse --tcpRetries 300 --tcpRegexResponse '^SSH'