Radio Silence 3.4 – Outbound application firewall ( Little Snitch! Alternative )

Radio Silence is an outbound application firewall that lets you block Internet access from individual apps.
 
Features:

100% Annoyance-free:
Radio Silence respects your concentration. That is why it will never interrupt you with pop-up windows or alerts.
Zero Maintenance:
Once Radio Silence is installed, you can forget all about it. It is always on and needs no attention from you.
Tiny and Fast:
Radio Silence weighs next to nothing. It doesn’t waste any time or resources, which also makes it blazingly fast.
Usable by Anyone:You don’t have to be a network expert to use Radio Silence. It takes care of all the technical details for you.