Here cometh a trove of Manfred's wonderfule and noth so wonderfule linkses, leading to all places possible and impossible. Disclaim do I, that dis list is surely not complete, as my memory has more holes than 'Huacan cheese visited by Kalap'lan mouse. Comes yet wyth His Manic Majesty's personnaly lejendary commentary!
For this list I give less guarantee than software-vendors do (ie: none).
Personal Resources (done by individuals or groups) http://mythmere.tripod.com
Mythmere, a wonderfule resource for most things you may seek. http://hiddenway.tripod.com/
Hiddenway, another great one. Be sure to see the city of Adelfarn. http://www.agyris.net
Agyris world and rich resources http://www.mythosa.net/
yet another world... http://www.maranci.net
seems boring? Note the RuneQuest pages! http://members.aol.com/MarkJYoung/
They say this guy is long in the business already... has quite a few good things at hand.(If you can find it.) One place is http://members.dandy.net/~mjyoung/writings.htm http://www.angelfire.com/ma/rpg/index.html
The World of Arumo. An interesting world-building idea. Pop-ups though. http://www.geocities.com/TimesSquare/Fortress/6394/gallery.html
Maelstrom Campaign, another must-see http://www.ddream.com
Place to find traps en-masse. http://www.io.com/~sjohn/
again, much to find and enjoy
Specialized and advisory resources http://elfwood.lysator.liu.se
Elfwood, an excellent place to find pictures and fan fiction. http://www.burningvoid.com/
Valuable advices for DM's. http://www.roleplayingtips.com
The name says it all. Good, but be warned that it slowly turns commercial. http://www.geocities.com/TimesSquare/Realm/5037/netbook/table.html
DM's Netbook ... bad links there or what? http://www.gamegrene.com
good advice, even Evil GM Tricks, hmmm... http://www.criticalmiss.com
RPGs seen the other way http://www.irony.com
Irony Games. Love them.
Directories (sort of commercial resources) http://www.rpgarchive.com http://www.dndresources.com/ http://www.dndadventure.com/index.html
...and others. http://www.fortunecity.com/victorian/byzantium/55/
The Blue Troll, one directory with character
Companies (downright commercial resources, or not quite so) http://www.basementgames.com
See Juravia. Not updated anymore. Freely accessible (requires login though) are many things. d**n, seems they deleted that over 200 brief yet usable rumours, that were there.
Know this one? A nice one, worth visiting. A d**n good resource, too. http://www.realmsofevil.net
Yeah, liked them for a long time... Things accessible from main page are seldom updated now, most of the activity goes on inside this corpse... which is not truly dead. http://www.gamingoutpost.com
Had lively forums, but now seems to grow dead. I was there for a short time before it turned commercial.