Games and Activities
Hero Machine 2.0
Insane X-Men
X-Men Battles
X-Men: Trio Squad

Marvel Humor
VG Cats - A really fun comic strip here about the X-Men Legends game.
Fantastic Four: Doomsday
House of M, Part 1
House of M, Part 2
House of M, Part 3
House of M, Part 4
Marvel Villains Assemble
X-Men: Death Becomes Them
X-Men: Revisiting Profit
X-Men: Dark Phoenix Rising
X-Men Divided, Part One

Roleplaying Sites
Academy X
Orenda Preparatory