ORVYL and WYLBUR
| Developer | Stanford University | 
|---|---|
| Written in | 360/370 Assembly language | 
| Working state | Discontinued | 
| Source model | Originally Open source; the later proprietary versions had licensed source | 
| Initial release | 1967, 1968 | 
| Available in | English | 
| Platforms | IBM S/360, S/370, and successors | 
| License | Originally public domain; the later proprietary versions had distinct licenses | 
| Official website | web | 
| History of IBM mainframe operating systems | 
|---|
ORVYL is a time-sharing monitor developed by Stanford University for IBM System/360 and System/370 computers in 1967–68. ORVYL was one of the first time-sharing systems to be made available for IBM computers. Wylbur is a text editor and word processor program designed to work either without ORVYL, or in conjunction with ORVYL.