http://www.meetingshed.com - bootstrapped, some interest and a few users, not enough to start a business. I keep it running because I use the VPS I set up for it for other stuff.
I'm getting warnings on Chrome regarding your SSL cert expiring.
Unfortunately the SSL cert expired and I just couldn't justify renewing it. I know they're not expensive but I have other priorities. It is still secured over https and I mainly keep it running to demo to anyone interested now and then.