I'm quite new to DOSBox myself, so I'm confused about what you mean by "get games to work."
Do you simply mean getting Arena/Daggerfall up and running?
If so, I don't know of any download that would get it running automatically. However, I found a great YouTube video for doing it yourself. (http://www.youtube.com/watch?v=_8aB7WhTAv0&feature=related)
You will also need to make a change in the Options file under your DOSbox folder.
To do this, open Options via: DOSBox-.074 -> Options -> DOSBox .074 Options
That will open up the Configuration setup. You'll have to make a change here. It's very simple though, so don't worry.
Under [dosbox], change memsize=16 to memsize=32. (Or change to 64 if you find it's still laggy)
Configuration setup changes complimentary of the UESP Wiki :hubbahubba:.
Sorry I didn't have a premodded download link like you were looking for, but I hope it helped.