I am simply talking about the versions of the packages in gNewSense's
repositories: GNOME 2.30, Firefox 3.5, LibreOffice 3.2, etc. If you want to
know about other applications, look at their versions in Debian stable:
https://packages.debian.org/stable/
Installing software not in the repository can quickly become a dependency
hell. Not to talk about the hassle of finding the packages in the first
place. Go for the packages in Debian testing if you really want to try
gNewSense: https://www.debian.org/distrib/packages
But, again, if you want a light GNU/Linux system where recent applications
are easily available, Trisquel Mini 7 is a way better option than gNewSense
3.1 (w.r.t. both criteria) : http://devel.trisquel.info/makeiso/iso/