Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Komodia Relay - Free open source tool to perform TCP based session relay