Paolo RedaelliMost of them are quite unnecessary when you have a POSIX command line (i.e. a GNU/Linux machine) available, but they may be nevertheless useful:
- Website Safety & Security Check https://www.ssltrust.com.au/ssl-tools/website-security-check
- Online port scanner https://www.whatismyip.com/port-scanner/ when you don’t have nmap
- Find my real IP address https://whatismyipaddress.com/ . When you just can’tFind my public ip address from linux command line (i.e.
curl ifconfig.me) - Domain name registration name lookup https://lookup.icann.org/ for those who don’t know the command whois
- Mind mapping https://coggle.it/
- Interface design https://www.figma.com/
- Develop Database and Data Warehouse without writing a single line of code https://sqldbm.com/
- Compiling any language online https://ideone.com/
- Code snippet sharing https://gist.github.com/
- Have I ever been pwned? https://haveibeenpwned.com/