Board/Card Games
Although these will sometimes require some printing and possibly cutting/pasting, the games themselves are free!
This
company went off the map a number of years ago but those in charge of
the properties have given permission for these games to be downloaded
and enjoyed for free! They all have some kind of sci-fi/fantasy theme.
There's even a complex and involving sword and sorcery solo game!
(Barbarian Prince)
Tons of rules variants to spice up your game collection, as well as some free "print and play" options!
Pagat.com
A
website collecting every known game that uses a traditional deck of
cards, PLUS some more recently created traditional deck games with
fantasy-themed geek appeal, such as RPG simulators and fantasy combat
games!
Role Playing Games
These are paper and pencil RPGs you can download for free and have your buddies over to play. Just use your laptop as the "GM screen" and you don't even have to print anything out!
OSRIC
OSRIC stands for "Old School Reference And Index Compilation" and is essentially a free version of the classic Dungeons And Dragons rules! Whether you regret selling all those old rulebooks or want to try classic D&D for the first time, OSRIC has everything you need!
Download The PDF
Visit Their Home Page
Swords And Wizardry
Swords And Wizardry is another free version of classic Dungeons And Dragons Rules, although streamlined even more for those who want a faster pace, less rules-intensive fantasy RPG experience.
Visit Their Home Page
1,000 Monkeys, 1,000 Typewriters
This site has even MORE RPGs to check out, and also seems to have a little bit more of a submission process to promote some quality control.
Visit Page
RPG Tools
Town Generation Tool(Website)
More accurately, a town population tool. Just feed this online tool some info about the town you want to populate. Choose from options including size, military level, setting, alignment, economy, and political type. Then with one click your town is populated with numerous types of characters of appropriate levels, stats and abilities, each with their own name! Populate courtyards, taverns and merchant districts instantly!
City Map Generator(Website)
This downloadable gadget allows you to instantly create town maps after feeding it some basic information (population, setting, etc). Very cool for those who suck at drawing maps!