use synaptic package manager(in menu>System>admin>).it contains all those softwares!digit simply provides source packages for Linux,that is not worth with Ubuntu and other distros which got apt and dpkg and better package management.
Anjuta is a good ide for c/cpp.eclipse is for java etc.again those source packages distributed by digit is a waste without a good package manager which resolves dependecies.that i'd say is a waste that digit carries these source packages.rather they shud provide linux distros in more and BIG softwares for eg;for Ubuntu-Aptoncd etc.
Dont try those source given from digit.its just illogical for eg;how it'll be if u get those .dll files,diffrnt config things etc wholesale to ur hand
instead of installshield setup or simply "setup.exe"-the same thing in linux/unix are those gzipped(.gz) or bzipped(.bz2) source files;for eg:ur xmms source!.
So the thing is there are very good package managers which can fetch you and install software without searching internet like in windows.for eg: Debian or Ubuntu have apt and dpkg doing a wonderful job.for redhat/fedora .rpm is there,yum is there etc.
So never try those outdated source and if possible any source packages,get ur package manager works for you!
for eg:in GNOME menu after Applications and Places,there is another menu called System which contains administration menu>in which there is synaptic manager.give ur local user password when prompted.
Do read below article very informative for Windows Users too:
*linux.oneandoneis2.org/LNW.htm