All software below is used in chapters 13 and above and are not strictly necessary. You have to determine for yourself if you want to install certain packages. If, for example, you don't intend to go online with the LFS system, you might not want to install the email, telnet, ftp, www, etc. utilities.
Netkit-base (0.17): ftp://ftp.uk.linux.org/pub/linux/Networking/netkit-devel/
Net-tools (1.54): http://www.tazenda.demon.co.uk/phil/net-tools/
Procmail (3.14): http://ftp://ftp.procmail.org/pub/procmail/
Sendmail (8.9.3): ftp://ftp.sendmail.org/pub/sendmail/
Mailx (8.1.1): http://www.linuxfromscratch.org/download/mailx-8.1.1-lfs.tar.gz
Mutt (1.01i): ftp://ftp.mutt.org/pub/mutt/
Fetchmail (5.2.0): http://www.tuxedo.org/~esr/fetchmail/
Netkit-telnet (0.17): ftp://ftp.uk.linux.org/linux/Networking/netkit-devel/
Proftpd (1.2.0pre9): ftp://ftp.tos.net/pub/proftpd/
Netkit-ftp (0.17): ftp://ftp.uk.linux.org/linux/Networking/netkit-devel/
Apache (1.3.11): http://www.apache.org/dist/
Zlib (1.1.3): http://www.cdrom.com/pub/infozip/zlib/
Lynx (2.8.2): http://www.slcc.edu/lynx/release/
PPP (2.3.11): ftp://cs.anu.edu.au/pub/software/ppp/
XFree86 (3.3.5): ftp://ftp..xfree86.org/pub/XFree86/
libPropList (0.9.1): ftp://ftp.windowmaker.org/pub/libs/
libXpm (4.7): ftp://sunsite.unc.edu/pub/Linux/libs/X/
libpng (1.0.3): http://www.cdrom.com/pub/png/
libtiff (3.4): ftp://ftp.sgi.com/graphics/tiff/
libjpeg (6b): http://www.ijg.org/
libungif (4.1.0): ftp://prtr-13.ucsc.edu/pub/libungif/
WindowMaker (0.61.1): ftp://ftp.windowmaker.org/pub/release/