QuickPage for Mac

From Dartware:

QuickPage for MacOS X is a version of the open source qpage software compiled to run on MacOS X. Complete information about qpage is available from its web site, http://www.qpage.org.
QuickPage offers two facilities:
* A Simple Network Paging Protocol (SNPP) server, that listens for SNPP messages, and sends them through an analogue modem using the TAP protocol;
* A paging client, that can send pages to a SNPP server.
Both facilities work together, and can run concurrently on the same computer. QuickPage has been ported to a number of platforms, and now it's available on MacOS X.