Vicomsoft produces InterGate (formerly Internet Gateway, and superseding Vicomsoft's SurfDoubler product), which allows multiple computers connected via a simple network connection to share a single Internet connection.
Pricing starts at $99 for a 5-user license, and tops out at $2,599 for a 2,000 user license.
Version 9.2.5 adds/changes the following:
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Can't find what you're looking for? Try a search:
Also, if you have an older Mac, be sure to check out the "Classic" applications page for more options.
Finally, take a look at ALEMIA if you think you know that name of an application, but aren't quite sure.
For an interesting and objective third-party view of Apple's networking technology - from MacTCP through Open Transport and beywond - Peter Sichel's Sustainable Softworks page is unparalleled.
These are applications that are newer and of potential interest, but which I haven't yet selected for permanent inclusion. Have a look, and let me know if you think they deserve to be part of the permanent collection!