what's the point of the open source port?
it looks like the original, it needs the original files, and i see no real benefits.
The same reason can be given for all ports:
-It runs natively and does not need DOS emulation (through DOSBox). This means it uses muss less system resources. This may not be important on most Desktop computers, but many portable devices usually struggle to run 486+ DOS games fluidly in DOSBox.
-It is possible to increase the visible area for higher resolutions or widescreen
-It is possible to fix bugs or make enhancements/additions/modifications to the original game (be it content, music, graphics, game rules, levels, etc.)
-It provides a true challenge for the coders to reverse engineer and re-implement all the original program's features
Of course all that only comes to fruition once the port is finished which takes a lot of work and time. I agree that the excellent emulation through DOSBox has eliminated a lot of incentive for such ports, but the reasons above are apparently still important enough for some people to invest that kind of work and time. :)