DVIasm is a TeX utility program written by Jin-Hwan Cho, that is
designed for editing DeVice-Independent (DVI) files directly.

It consists of a single Python program, dviasm.py, in a human readable
text format and it runs on any platform in which Python is installed.

All revisions of DVIasm can be downloaded at

http://svn.ktug.or.kr/viewvc/dviasm/?root=ChoF

It is fully documented at

http://tug.org/TUGboat/Articles/tb28-2/tb89cho.pdf (TUGboat)
http://ajt.ktug.kr/assets/2008/5/1/0201cho.pdf (Asian Journal of TeX)

Jin-Hwan Cho <chofchof_at_ktug.or.kr>, the developer of DVIPDFMx.