I know of Webmin, may not be very feature rich for people wanting to do hosting though. Never heard of the other recommendation above (VestaCP) .. perhaps worth checking it out.
Been using Sentora, vestaCP and Froxlor for quite a while now. They all work well and with some improvements like PHP-FPM or Percona instead of MySQL they work even better. Though there are some security concerns around them and it's best to add an extra layer of security to them as well.
There are different free and paid control panels but here is ISPConfig and Virtualmin are the most popular free VPS control panels that make managing your server easier.