Does anyone make a Door Bell for the Qolsys Panel that is similar to the 2Gig Door bell?
According to Interlogix there is not, and I have never seen one outside of Jasco wireless chimes, but those do not use the same frequency I do not believe.
You can always use a Resolution Products wired takeover module and an existing wired doorbell to achieve the same thing. In this case you could wire up a few more things to the 8 available zones for other Automation features. (Regular old wall witches for Zwave lighting control using Alarm.com rules, etc.)