// DOS
DOS BBS systems are still existing in the wild wild world of the internet, even in 2022. They're either running on a Legacy Computer with Windows 98 or a Windows system that can run 16bit DOS. You can also run them with a Telnet FOSSIL driver or Serial port connection under 32-bit editions of Windows (including Windows 10).
// PCBoard

Developed by Clark Development Company

// Searchlight

Developed by Franl LaRosa of Searchlight Software

// Oblivion/2

Developed by Darkened Emnity, HEX,
Shivan Bastard, and Sir Roadkill