V6 was notable for Lions' Commentary on UNIX 6th Edition, also known as the Lions Book after its author, UNSW professor John Lions. This book was an edited selection of the main parts of the kernel as implemented for a Digital PDP-11/40, and was the main source of kernel documentation for many early Unix developers.
IS/1 was INTERACTIVE's enhanced V6, the first ever commercially sold Unix version.
A port of V6 to the Interdata 7/32 was completed by Richard Miller and Ross Nealon at Wollongong University, Australia, during 1976-1977. This project was supervised by professor Juris Reinfelds. The resulting system was called Wollongong Interdata UNIX, Level 6. This distribution also included utilities developed at Wollongong, and later releases had features of V7, notably its C compiler. Wollongong Unix was the first ever port to a platform other than the PDP series of computers, proving that portable operating systems were indeed feasible, and that C was the language in which to write them.
A version of V6 for lower-end PDP-11 systems, such as the 11/10, was available as MINI-UNIX.
PWB/UNIX 1.0 was based on V6 (earlier, internal use-only versions were based on V4 and V5).
AUSAM (Australian Unix Share Accounting Method), released in November 1979, was a V6 variant from the University of Sydney, Australia. Its main improvements were better security and process accounting.