Free forests of the world software for linux

Labyrinth of Worlds project is an Ultima Underworld II rewrite.
LoW is a rewrite of the first-person role-playing game Ultima Underworld II: Labyrinth of Worlds that came out in the early 1990s. One of the most celebrated game of its genre, this rewrite attempts to recapture the minutiae and spirit of the original.
At the moment, the tech demo allows you to walk (and jump) around all the Underworld II levels and worlds, has all NPCs and most monsters. You also get to see and manipulate all the dynamic objects of the game, and peek inside containers. The paperdoll has been implemented, too, and lets you access your inventory as well as wear/wield armor and weapons.
It is now possible to converse with the various NPCs. While not all the conversations work correctly (or at all) most do for the most part and it is now possible to actually understand the storyline. :) NPCs are also able to give items, now.
Another worthy project you might want to go take a look at is Underworld Adventures which seeks to recreate the first installement of that series and is doing a darn good job of it.
If you are an Ultima VII fan, then Exult is going to tickle you pink! The freshly released version 1.0 will allow you to play Black Gate and Serpent Isle with the addons on modern architectures, with a few gameplay improvements to boot!
Enhancements:
- Fixed executables
- new gameplay features, including wearable items
- improved user interface
- performance improvements
- more complete conversation support (including being given items),
- working keys and locks

Robot World aims to be a distributed physical environment inhabited by programmable robots, spanning across countless computers on the internet in true peer-to-peer fashion.
Robot World components:
- Parser / compiler compiles robot programs into byte code, stored in a .xml file
- Inject - send a robot program to the world
- RobotWorld - the world simulation program
- dsm - the bytecode disassembler
- rowo.y - language grammar file
parser
Compile a robot. Creates an .xml file from a .r file
$ parser sample.r
dsm
Disassembles a robot .xml file.
$ dsm sample.xml
robotworld
Testbed. Receiving server for "inject" - see below.
$ robotworld
inject
Send robot to world. "robotworld" must be running.
$ inject sample.xml

HELIO World project is a PHP class that generates world maps.

Safe::World can create multiple virtual instances of a Perl interpreter that can be assembled together.

SYNOPSIS

See USE section for complexer example and the test.pl script.

use Safe::World ;

my $world = Safe::World->new(
stdout => $stdout , ## - redirect STDOUT to this scalar.
stderr => $stderr , ## - redirect STDERR to this scalar.
flush => 1 , ## - output is flushed, soo dont need to wait exit to
## have all the data inside $stdout.
) ;

## Evaluate some code:
$world->eval(q`
use Data::Dumper ;
print Dumper( {a => 1 , b => 2} ) ;
`);

$world->close ; ## ensure that everything is finished and flushed.

die($stderr) if $stderr ;

print $stdout ;

$world = undef ; ## Destroy the world. Here the compartment is cleanned.

Note that in this example, inside the World is loaded Data::Dumper, but Data::Dumper was loaded only inside of it, keeping the outside normal.

Tile World is an emulation of the game "Chips Challenge". "Chips Challenge" was originally written for the Atari Lynx by Chuck Sommerville, and was later ported to MS Windows by Microsoft (among other ports).

Please note: Tile World is an emulation of the game engine(s) only. It does not come with the chips.dat file that contains the original level set. This file is copyrighted and cannot be freely distributed. The chips.dat file was originally part of the MS version of "Chips Challenge". If you have a copy of this version of the game, you can use that file to play the game in Tile World. If you do not have a copy of this file, however, you can still play Tile World with the many freely available level sets created by fans of the original game, including CCLP2.

"Chips Challenge" is a game made up of both intellectually engaging puzzles and situations demanding fast reflexes. As you might have guessed, it is a tile-based game. The object of each level is simply to get out -- i.e., to find and achieve the exit tile. This simple task, however, can sometimes be extremely challenging.

The Mana World (TMW) is a serious effort to create an innovative free and open source MMORPG. TMW uses 2D graphics and aims to create a large and diverse interactive world. The Mana World project is licensed under the GPL, making sure this game cant ever run away from you.

The project includes the development of both a client and a server, as well as the development of an online world. At the moment were making alpha releases of the client, while our server is in early development.

The eAthena free software Ragnarok Online server is used until our own server has matured enough to replace it. Once ready, well be making releases of our server too so anybody will be free to set up their own server and start building their own online world.

Rail World project is a 2-D train simulation game.
Rail World is a railroad train simulation game designed to bring the features of model railroading to the desktop using actual aerial or satellite photographs as the backdrop for maps.
You can control multiple trains, switches, load/unload cargo, and more.
Main features:
- Use actual aerial photographs or satellite images as the basis for maps.
- Manage multiple trains as a conductor.
- Drive trains using throttle and brake as an engineer.
- Grapple with realistic physics, including stopping distance and collisions.
- Set switches and specific train routing.
- Load and unload cargo.

Way of The Warrior: Sons of Twilight is a Web-based boardgame of fantasy battle. Like a boardgame, it is turn based and at least 2 players are neeed, but there is no upper limit on the number of players.
Way Of The Warrior: Sons of twilight is fully and easily customizable, from the unit to the board tile.
Enhancements:
- board visualization is now good
- sincronization algoritm for the save process