Links

Game Systems:

Basic Fantasy
D6 System
Delving Deeper

Dungeon Crawl Classics

Dungeonslayers
Kill it with Fire

References:

Crawl! fanzine- A fanzine to include new patrons, classes, and more!

People Them With Monsters - Excellent resources for DCC RPG. They have resource sheets,
      adventures,   and character sheets to help ease the experience of getting in to the DCC system. 

Purple Sorcerer- Character generators for both level 0s and for upper levels, Crawler Companion app
      for iOS, Android, and browser. He also has some rockin adventures! Seriously, this guy has
      some awesome stuff!

Tools: 

Dave's Mapper- A very handy means of being able to generate a large variety of randomly generated maps over a variety of settings!

G+ Communities:

Dungeon Crawl Classics G+ Community - This community site is thriving! Excellent source of 

inspiration, rules, adventures, items, spells and more!

Roll20 G+ Community - If you haven't heard of Roll 20 by now, you should check it out. Think of it being the ultimate tool for online virtual tabletop gaming!