Sygate Personal Firewall
Full user review
"The best so far!"
I have tested 14 free firewall products and this is the best so far. Very easy to install and configure. User friendly interface with a lot of room for tweaking.
I haven't found any yet
How can you go wrong with a free firewall made by Norton? It works great, has a sandbox feature, and one right click on the tray icon gives you total control.