Free storage engine software for linux

BerkeleyDB Backend Storage Engine for DURUS project provides a storage engine for DURUS, a persistence system for the Python programming language.
Some advantages compared to Durus standard FileStorage:
- Startup time is negligible.
- You dont need an in-memory index, so your repository size is only limited by storage space, not RAM.
- If you change existing objects, your storage size doesnt increase.
- If you delete objects, those objects are garbage collected in background, slowly, without performance degradation.
- You can still do a full fast collection, if you need it. While this collection is in progress, Durus still serves objects. From time to time, nevertheless, it can be unresponsible for 2 or 3 seconds, while is doing a checkpointing to be able to free database logging diskspace.
- Garbage collection doesnt increase storage size. Neither RAM usage.
- Garbage collection deletes objects using nondurable transactions, very efficiently. If the collection is aborted abruptly (program or machine crashes), the collection will start again from the beginning. If the GC finishes without problems, that state is durable.
- Any object store in the storage will commit a durable transaction, including all objects released in the background garbage collector, along the way.
- Garbage collection time is proportional to garbage, not repository size.
There are some disadvantages, nevertheless:
- IMPORTANT: This backend uses reference counting to decide when an object is garbage and can be collected. So, if you have cycles in your data structures, you **MUST*BREAK** them before releasing the objects.
- Failing to do that will leak diskspace. It is possible that in a future release we can collect cycles, but try to avoid that pattern.
- Leaking objects will grow the diskspace, but **NO** corruption or malfunction will happen. No other secondary effect.
- Although this code could work on Windows, I havent checked it. Absolutely no garantee!.
- Sometimes this backend can become irresponsible for a couple of seconds. It is busy doing a checkpoint to recycle database logging space. The pause should be sort, nevertheless.
- Dont use this storage backend over NFS, at least you know what is going on.
- Since we are using BerkeleyDB as the backend:
- You should be experienced with BerkeleyDB deployments.
- Beware when updating Python or BerkeleyDB. In particular, BerkeleyDB is known by breaking (but they DOCUMENT!) binary compatibility between versions. In this case, they ALWAYS document the procedure to do a controlled upgrade, so dont worry. But take note of the risk.
- To do a trustable backup, you should follow instructions in BerkeleyDB documentation:
- http://www.sleepycat.com/docs/ref/transapp/reclimit.html
- http://www.sleepycat.com/docs/ref/transapp/archival.html
- http://www.sleepycat.com/docs/utility/db_hotbackup.html
- In Python you can use the standard "bsddb" or the up-to-date "bsddb3" bindings (which will be included in new python versions). This product will try to use always the more recent BerkeleyDB bindings. Be careful about BerkeleyDB version changes when you update the bindings.
- Since BerkeleyDB files are binary structures, a corrupt database can be unrecoverable. Be diligent and careful with your backups.
You can use this product both as a normal (local) filestorage, or a server (remote) storage system, just like the usual Durus FileStorage.
Enhancements:
- Compatibility with Durus 3.7 was added.

PHP Tag Engine project is a library that allows you to easily add tagging functionality to a PHP application.
Main features:
- PHP Tag Engine has a full AJAX front-end for tagging, as well as methods for programatically adding tags in your code. The front-end tagging interface even has auto-complete functionality using the excellent Yahoo! Auto-Complete library.
- A built-in cache to reduce database queries.
- The PHP Tag Engine code is fully documented in PHP Doc format, and PHP Doc generated documentation is available for download.
- Fully internationalized including Javascript strings. English localization included.

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

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.

Smooth Engine is a simple, smooth, yet versatile theme engine, capable of mimicing many theme engines; it is designed to be highly flexible yet retain a relatively small footprint to provide a fair balance between speed, memory, and overall design.

madlibs engine project is a MadLibs clone.

The madlibs engine is a tiny engine for MadLibs-like interactive stories. Basically, you enter different words of a certain part of speech.

The program pastes them into a story text, creating weird, funny, or stupid results.

It runs on anything from a line printer to an xterm.

Lua Messaging Engine (LuME) is a set of scripts that offer abstract functions for communication via AOLs OSCAR protocol (as used by ICQ and AIM clients), Microsoft Messengers MSNP, and Yahoos YIM protocol. Lua Messaging Engine also includes utility functions for string operations, SHA hashing, and basic HTTPS communication.

An increasing number of software developers are making use of the simplicity and power behind employing a Lua script interface.

Meetroduction, LLC has been using a Lua script interface as a core design concept for the multi protocol messaging component of its proximity based people finder client: Meetro. Beyond that, the interface offers its users a flexible way to vastly extend the clients functionality.