[Linuxephus™]

As virus, in it's latin origin is neither masculine or feminine, it's technically correct for it's plural form (when used in the nominative case at least) to be vira. That being said the correct plural form in the English language is indeed viruses.

More on topic this has potential to be a really useful thread. It could be improved by capitalizing some of the terms used, Xss to be changed to XSS for example. You also use several methods to separate the subject from it's definition, you should try use one for consistency; my personal preference would be colons or dashes but then again it's your thread so it's your call.

Aside from that, keep it up.

True that may be, however the use of Vira is deprecated and rarely is an applicable use of the word in it's Latin context which makes it more of a subjective matter more so than the nominative use even where Latin is still spoken or written in the few nations that still prefer Latin as a native language.
Masculine and feminine specifics being irrelevant since the use of gender specific descriptors are also not applicable even in the most generic of uses.

P.S.-Agreed.
An excellent tutorial nonetheless.