What is ActionScript 3?
Quote Originally Posted by Adobe.com
ActionScript 3.0 is a powerful, object-oriented programming language that signifies an important step in the evolution of the capabilities of the Flash Player runtime. The motivation driving ActionScript 3.0 is to create a language ideally suited for rapidly building rich Internet applications, which have become an essential part of the web experience.
AS3 games are hackable. This list is now of the pending AS3 games that will be hacked eventually.(Note: global moderator or a moderator needs to take care of the task of updating this.)

Bold means newest game(s) added.
Games:
5 Minutes To Kill Yourself
Apple Defender
Astral Tower Defense
Bloons Tower Defence 3
Bounty Killers
Boxhead Zombie Wars
Dogfight 2
Fire In The Hole 2
GeoWars
GluFo
Hunted Forever
Khronos
Kings Island
Luncheon of the Dead
Mud and Blood 2.1
Orbs
PALADIN the game
Random Defense
Robotkill
Rover Acher
Shopping City
Straw Hat Samurai
Stunt Pilot
Swords and Sandals 3: Solo Ultratus
Tech-Wars
Vector
Warfare 1917
White Board Tower Defense
World War Tower Defence