Comparison of file managers

Columns: Name | Creator | First public version ( date ) | Latest stable version ( date , number ) | Cost | Software license
Altap Salamander | Altap | August 15 , 1997 ( 1997-08-15 ) | July 1 , 2019 ; 7 months ago ( 2019-07-01 ) ( 4.0 ) | Free | Proprietary | Commander One | Eltima Software | August 4 , 2015 ( 2015-08-04 ) | 2019 ; 1 year ago ( 2019 ) ( 2.3 ) | US $ 29.95 | Proprietary | CRAX Commander | Soft4U2 | September 1 , 2013 ( 2013-09-01 ) | June 5 , 2018 ; 20 months ago ( 2018-06-05 ) ( 1.11.1 ) | US $ 19.99 | Proprietary | Directory Opus | Jonathan Potter , GPSoftware | Amiga : v1 ( 1990-01-03 ) Windows : v6 ( 2001-06-18 ) | December 19 , 2018 ; 13 months ago ( 2018-12-19 ) ( 12.11 ) | A $ 49 lite / A $ 89 pro | Proprietary | Dired | integral part of Emacs , part of the GNU project | 1974 ? | July 30 , 2009 ; 10 years ago ( 2009-07-30 ) ( 7.17 ) | Free | GPL | Dolphin | KDE | June 7 , 2006 ( 2006-06-07 ) ( 0.5 ) | 19.12.1 ( 9 January 2020 ; 27 days ago ( 2020-01-09 ) ) [ ± ] | Free | GPL | DOS Navigator | Ritlabs | 1991 ( 0.90 ) | 1999 ( 1.51 ) | Free | BSD original

Example questions:
What operating system can use the file manager that was created by David Ercig ? | When was the file manager that was created by Brian Havard ported to Microsoft Windows ? | How many people started up the company that created File Manager ? | What was the file manager that had it 's last stable version in 2009 originally released as ? | Who develops the file manager that had it 's last stable update on April 22 , 2019 ?

Answers:
Microsoft Windows | 1997 | 2 | PC/GEOS | Michael Herrmann