The following fall under the GNU Affero General Public License 3.0. 
Read AGPLv3.TXT for details.

+-----------------+
| PROGRAMS\OFFICE |
+-----------------+

MuPDF
PROGRAMS\OFFICE\mupdf
The version that is included with PsychDOS is the same that is included 
with XFDOS (https://sourceforge.net/projects/fltk-dos/). However, there
once again is not mention of a license with the software, or from what I
can find. However, if you go to https://mupdf.com/downloads/index.html 
or just look at the included copy of the page at SOURCE\SOURCE.HTM, it 
is likely to be licensed as AGPL. The site does not state which version 
and I cannot confirm which version of MuPDF this is, but given the date 
it is most likely AGPL version 3.0.