By CuriousMarc on YouTube:

• YouTube - Qualstar 9-Track Tape drive and Mac SE/30 in action on 2014-08-16.
• HP and Overland 9-Track Tape Drives Demo on 2015-10-14.
• Qualstar 1260S 9-Track Magnetic Tape Drive Repair on 2015-10-19.
• HP 7970E Tape Drive Repair on 2016-10-01.

YouTube - Qualstar 3404S 9-Track Reel-to-Reel Tape on 2018-08-06 by TX Dj.

nixCraft - 15 Useful Linux and Unix Tape Managements Commands For Sysadmins

GitHub - samuelncui/yatm Yet Another Tape Manager - Full Functional Tape Management System with Web User Interface.
GitHub - mnott/pytp Python Tape Manager.
GitHub - speed47/lto-info Tool to read information in Ultrium LTO Cartridges from a tape drive.

dbit.com - ibmpc utils contains st.exe and the source files mentioned below.

From dbit.com - ibmpc utils - README:

Can be used to capture tape images for Ersatz-11, among other things.  
Use "st -f scsi6: iget foo.tap" to read the
entire tape at SCSI ID 6 into the file "foo.tap", suitable for use
with E11's MOUNT command.  It can also go the other way, use "iput"
instead of "iget" to write foo.tap onto the tape.  Fixed block sizes
with recordless files are also supported, like what you get with the
UNIX "dd" program.

I'm ashamed to say this is written in C (Watcom 11.0).  It was
originally intended as sample code to be supplied to a contractor
(otherwise it would have been in assembly language like everything
else I do), but it evolved into a utility in its own right.

Files are:

aspi.c	DOS ASPI interface code
st.c	the utility itself
st.h	definitions
st.lnk	linker script

Build it with wcc aspi, wcc st, wlink @st (first change the "libpath"
lines in st.lnk to point at where the Watcom libraries are on your
system, unless you configured your Watcom better than I did).