All of these programs require a TCL interpreter. Most [Li|U]nix installations have one by default. Macintosh (classic) and Windows users can download an interpreter from http://www.tcl.tk. OS X users have Tcl/Tk standard. These toys aren't picky about which one.
Just because one involves child birth, and another wedding planning, 2 VERY popular topics to sue people about, make sure you read the license.terms. To summarize, you got this for free, and I don't make any claims about it's performance.