As amazing as special effects have become, the best part of them is how accessible CGI has become to the general public. These are a few offerings, all inspired by video gaming franchises:

Portal: No Escape

Half-Life: Escape From City 17 – Part One

Half-Life: Escape From City 17 – Part Two

Beyond Black Mesa

Not only the quality of these is constantly improving, but the plot development is usually so well done that makes most Hollywood movies feel like crap.