Pingus

Pingus is a free Lemmings-like game with 22 playable levels. You command a bunch of penguins and guide them around in levels. Since the animals walk on their own, you can influence them only by giving them commands, such as build a bridge, dig a hole, or redirect all animals in the other direction. The goal of each level is to reach the exit.

Pingus is similar to:

Lemmings

Pingus is used for:

game

Who uses Pingus:

gamer, home user

Features:

a free Lemmings-like game covered under the GNU GPL
features 22 playable levels and runs under a wide variety of operating systems (Linux, Windows, etc.)
you get the sources and are allowed and encouraged to change and distribute them
original artwork, a built-in level editor, new actions, multiplayer and a few other features