Angled Certificate Authority is a online tool to keep track of, and issue new certificates for use on your local network. The certificates can be used in your private network at home to secure communication between your IoT devices, or in the corporate network to build trust in your local infrastructure without the cost of official root ca based certificates.

Oh, and it's free, and we promise that what is free now, will continue to be free (we reserve the right to add paid extras in the future, maybe)