XombieSub

XombieSub is the name of a subtitling application and a subtitle format.

The application is written in legacy Visual Basic. It doesn't seem to work on all computers, for unknown reasons.

The format is mostly a variation of ASS, and XombieSub and ASS files are much alike.

VSFilter can read and render XombieSub files.

Website:  http://www.seijin.net/ (site is dead, The Wayback Machine has  old version)