Free doomsday engine software for linux

Drome Engine is a 3D game engine thats written in C++ and uses OpenGL for graphics rendering. Its currently under constant development; the main focus at this time is to improve and stabilize the application programming interface (API).

iSearch engine project is an internal web site search engine.
Built to run as a CGI module, iSearch performs a searching for one or more character sequences ( terms ) within documents in a web site, without the needing of external indexing and filtering tools, like, for example, a database engine.
iSearch performs a real time elaboration of HTML documents in a web site, every time it is invoked. Documents are found, filtered from unnecessary parts, like HTML tag, and then inspected searching for the input terms.
iSearch acts under the directives set in its configuration file. You can set one or more starting search path, exclude file or directories from scanning, set your own output templates, and so on.
So if you want to add an internal search engine in your web site, iSearch is one of your possible solutions.
iSearch is written in C and the source code is based on Yed technology.
Main features:
- iSearch is a CGI module written in C, available for both GNU/Linux and Windows environment.
- iSearch latest release has been developed and tested within an Apache HTTP server. OS involved are Slackware GNU/Linux and Windows XP SP2, both on a i686 architecture.
- When invoked, iSearch scans recursively directories in a web site extracting files so-called documents. In every document extracted, iSearch performs a filtering to delete unnecessary information, like HTML tags. Then, the pure resulting text is inspected searching for the characters sequences received in input, so-called terms.
- A term can be a single word, but also a sequence of words enclosed with character "; in this latter case, the sequence will be treated as a single term ( i.e. "sowing the seeds of love" ).
- All documents containing all the terms will be output according to user templates and related environment.
- All terms are matched in boolean AND mode: only a document containing all terms is considered as a matched document.
- All terms are matched in case-insensitive mode.
Enhancements:
- The ID Input parameter is now optional.
- If omitted, it defaults to the first < root > element of the configuration.
- Handling of eventual error explanation string was added in displaying error templates, through the new token "%det".
- Its now possible to search for strings enclosed with quotation marks (").
- The source code has been totally reorganized.
- The < replace > element was added in the configuration file.
- This element contains a list of strings to replace or cut from documents to inspect.

Eclipse is a set of C++ classes designed to give beginner developers a head start in developing their first games as well as more experienced developers who dont want to have to write code for mundane tasks like fonts, sprites, and image loading.

Eclipse 2D Game Engine provides bitmap fonts, window management, audio capabilities, image loading, error logging, and zip file support.

The Wurld 3D Engine is yet another 3D gaming engine. It is light, fast, has minimal external requirements, and is still very immature. The project is Python scriptable, including support for generating models using 3D turtle graphics.

Fuzz Engine is an SDL/Mono-based 2D game engine that loads its games from XML so that anyone with a simple text editor can produce their own high-performance games in minutes.

Known problems: the platform game system is still pretty flaky.

Siriel4 game engine project is a game engine for adventure, arcade, maze-like games.
The main goal of this engine is to provide tools and scripts for easy game creation.
Game creators only write the necessary scenario descriptions for the game in a scripting language (such as Lua) and do not have to care about such low-level details as animation loading, etc.
Main features:
- Lua-5.0 - scripting language support
- DUMB - music and audio support
- Multiplayer
- Terminal support for controlling engine
Enhancements:
- fixed widget system
- removed procedure for separate processing of widget and replaced by flag indicating status of widget
- basic support of room neighbours
- fixed Makefile - include paths
- fixed freeze mode of univers (bug: avatar can move in freeze mode)
- callback function
- avatar can walk through rooms
- fixed processing and displaying things in correct rooms, so they display only in rooms where they are connected to
- fixed collision with object

Sphere RPG Engine project is a role-playing game creation engine.

Sphere is a RPGCE (a role-playing game (RPG) creation engine) that allows you to relatively easily put together an RPG along the lines of Final Fantasy 6 or Phantasy Star.

It supports 32-bit graphics (with 256 levels of translucency) and MP3, Ogg, MOD, S3M, IT, and XM files for audio (and WAV and SPX (speex) for sound effects), and does not place arbitrary limits on map, tile set, sprite set, or script sizes.

It also supports the three standard modes of input for games: keyboard, mouse, and joystick.

Sphere uses SpiderMonkey (Mozillas JavaScript implementation) for scripting. JavaScript is a very powerful, easy, and flexible language.

The core Sphere engine, after being installed, can run several games. This means that the games dont have to be distributed with the engine, saving download time and disk space. Also, the games can be run on other operating systems, such as Linux, if the engine runs there. On the other hand, you can include the Sphere engine with your game so that Windows users can run your game out of the box.

The Sphere engine is based around maps. Maps use tilesets, which are collections of tiles. A map of a beach would have tiles that represent the sand, the water, clouds, signs, and anything else on the beach. Sphere has support for animated tiles.

Torches could flicker in a cave, or waves could lap at the shore. Maps support unlimited layers, each with parallax and automatic scrolling.

Objects in Sphere are represented as entities. Townspeople are defined with spritesets, which are collections of frames. People can walk in eight directions, and have special directions (usually used for emotions or running). Unlike most RPG engines, spritesets in Sphere have a variable size. Large animal spritesets are used just as easily as people.