For guy who wants to be a master of network (WAN/LAN, no matter it's black, red or white), without help of various off-the-shelf classical network utilities for multipurpose uses, I'm afraid your level will stay in the DOS era of last century forever. I mean, in that case, even it was you invented the whole Internet, you could not do anything interesting or exciting.

Apache OpenOffice (short for AOO, formerly known as OpenOffice.org, also called OOo), long time ago, its predecessor is the commercial Office software - StarOffice, now, it is a set of open-source, cross-platform office suite, supports a variety of operating systems (Windows, Linux, MacOS X, Solaris and so on).