I use objective-see suite of products like little snitch (well their new open source version named something different), knock-knock, block-block and kext-viewe

I use objective-see suite of products like little snitch (well their new open source version named something different), knock-knock, block-block and kext-viewer. They are all free and let you know what is going on without tryinb to manage everything. They also have a simple menu item that lets you know if youre camera is hijacked. I like their sodtware