Pingus for Linux is a free Lemmingstm-like puzzle game covered under the GNU GPL.
Pingus features currently 77 playable levels and runs under a wide variety of operating systems (Linux, Windows, MacOSX, etc.)
Pingus has started at the end of 1998 with the simple goal to create a Free (as in freedom, not as in free beer) Lemmingstm clone.
The Free means you get the sources and are allowed and encouraged to change and distribute them.
You basically get everything that I used to create this game. In the years it has grown than quite a bit over the original goal and become something more than just a clone, we have original artwork, a built-in level editor, new actions, multiplayer and a few other features.
Fonte : http://pkgs.org/pingus-for-linux/