Papers using the software can be send to a variety of outlets.
In principle, however, it is difficult to publish a paper that describes an original way to make a plot, to print output, to perform a complicated analysis in a particular package. Some of this goes to American Statistician, if it uses Glim it can go to Applied Statistics, otherwise it winds up in the Interface Proceedings or the Sugi proceedings or the Xlisp-Stat mailing list. If there is to much emphasis on the actual program, it cannot go into the usual statistics journals, not even into the computational statistics journals. The setup is not unlike JSE, the contents will be like TOMS or the algorithms section of Applied Stat. Of course traditional code that needs to be compiled is welcome too, but it will be a hassle to make it interactive, and there are other outlets for it.