freeradius(8) on Linux
The text 305695b1f4c4, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
Authentication, Authorization and Accounting server
Flags it lists
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-A -
-S -
-X -
-b -
-c -
-f -
-g -
-i -
-p -
-s -
-v -
-x -
-y -
-z