CroxyProxy - CroxyProxy is the most advanced free and secure web proxy.
Micro Snitch - Micro Snitch is an ultra-light menu bar application that operates inconspicuously. It helps figuring out if someone’s spying on you.
ProxySite - free web proxy in the browser
Oversight - Get notified when an app accesses your Mac's camera or mic
Camcovr - Stylish webcam covers that protect your privacy
Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.