Free for home use. Well regarded and simple to use.
http://ntcanuck.com/ Web site can be slow.
The discussion forums for it are linked on
http://ntcanuck.com/forums.htm
As you seem to be in Europe and on NTL Cable then choose the "OSRC"
root server in preference to the default "ICANN" root server (use
Start | Programs | Treewalk). Confirm you are on OSRC by accessing
this URL in your web browser as the ICANN root server can not resolve
it:
http://atlantic.ocean/