PPPoE (Point-to-Point Protocol over Ethernet) is a protocol used by many DSL Internet Service Providers. RP-PPPoE is a free PPPoE client, relay and server for Linux.
Commercial PPPoE Server
Fine Point Networks sells a commercial PPPoE server based on rp-pppoe; their product is called ServPoET BMS.
You can download RP-PPPoE here:
RP-PPPoE is free software; it comes without warranty or support. I regret that I cannot offer e-mail or telephone support for RP-PPPoE. If you received RP-PPPoE as part of a Linux distribution you paid for, you may have the right to support from the distribution vendor. Try your vendor first.
I run a mailing list for RP-PPPoE; please visit the list information page to sign up.