Description from the [former developer's website][1]:

"Overview
ToySight Gold is a set of cool games and toys to play using your
iSight or similar FireWire camera. Using a system of object and motion
detection to track your position, ToySight Gold allows you to control
buttons, sliders and perform gestures on the screen, putting you right
in the action!

Gold is Good

The games featured in ToySight Gold run the gamut from Sky Diver, in
which you freefall through the air and try to land as close to a
target as possible, to PieSight, where the challenge lies in splatting
monkeys with custard pies before they can throw bananas at you. You
can even grab objects off your desk for Toy War, in which ToySight
Gold creates a digital replica of what it sees in the camera and
places it in an arena, where it battles another toy supplied by a
friend.

When your epic toy battle ends, keep your friend around for two more
multi-player games, Submarines and Tennis Xtreme. In the former, two
subs move back and forth on either side of an island, automatically
firing missiles every five seconds. You move a slider to change the
missile?s angle and try to hit your opponent. First one to reach five
strikes wins. Tennis Xtreme is played with tanks instead of paddles.
The tanks volley a ticking time bomb, scoring when it explodes on
their opponent.

Finally, there?s Flysight, Mars Lander and AirHeads. With Flysight,
you?ll enter the cockpit and engage in dogfights with up to eight of
your friends via Mac OS X?s Bonjour networking! In Mars Lander, you
must safely navigate harsh Martian terrain to perform rescue missions.
Airheads allow you to inflate your opponents? heads until they bursts
(don?t worry it?s not as messy as it sounds).

Features

15 different game types, plus the ?air harp? musical instrument and
party mode!
Control your games like never before.
Gorgeous OpenGL-based graphics.
The ultimate party game."

The first download link is the demo version v1.01.
The second download link is the updater to version v1.1.2.

See also: [ToySight Gold CD][2]

System requirements:
iSight or other Firewire video camera
Mac OS X 10.1.5 or higher
G3, G4, or G5 Processor
400 MHz or faster
32 MB VRAM minimum
256 MB RAM minimum
200 MB hard drive space minimum
Compatible with Mac OS X 10.6 (Snow Leopard)

Compatibility
Architecture: PPC

  [1]: http://web.archive.org/web/20110614212129/http://www.freeverse.com/mac/product/?id=45
  [2]: http://macintoshgarden.org/games/toysight-gold-0