Free web database software software for linux

Used Textbook Database provides a database for listing used textbooks.

Used Textbook Database is a Web-based textbook database that lets users to create an account and list their used textbooks or books.

It is very modular and customizable and allows for easy integration into an existing Web site.

Zild Database Library implements a small and easy to use database API with an easy to use API.
Main features:
- ability to connect to multiple database systems
- zero runtime configuration
- ability to connect using a URL scheme
- thread-safe connection pooling.

Web Business Pro is a Web application designed for everyday business activities. The project includes support for customer lists, inventory, receipt printing, and accounting. Fully featured search functions and filters make it easy to find what you need quickly.

H2 Database Engine is a free SQL database engine writen in Java.
JDBC and ODBC APIs are supported. Embedded and server modes are available. A Web console application is included. Clustering is supported.H2 Database Engine is a web based java database engine.
Main features:
Fast database engine
- Free, source code is included
- Supports standard SQL
- Written in Java
- Disk based or in-memory databases
- Browser base Console application
- JDBC API
- Limited ODBC support
- Embedded and client/server (network) mode
- High availablility support (clustering / failover)
- Wide range of data types including large objects (BLOB/CLOB)
- Strong security features (SSL, users, roles, encrypted files)
- Multiple connections, table level locking
- Cost based optimizer, using a genetic algorithm for complex queries
- Transaction support (serializable transaction isolation)
- Zero-administration, automatic recovery
- Large resultset, external sorting
- Scrollable and updatable resultset support
- Read only views and inline views
- Inner and outer joins, subqueries
- Many functions already built-in
- Triggers and Java functions / stored procedures
- Referential integrity / foreign key constraints with cascade, check constraints
- Multiple schema support
- Compatibility modes for HSQLDB, MySQL and PostgreSQL
- Sequence and autoincrement columns
- Well tested (high code coverage, randomized stress tests)
- Small footprint (smaller than 1 MB)
- Uses a small number of database files
- Can be compiled to native code using GCJ
- Primary keys, multiple index types (b-tree, linear hash, tree, hash)
- ORDER BY, GROUP BY, HAVING, UNION, LIMIT
- Information Schema
- Multiple connections
- Collation support
- EXPLAIN PLAN support
- The database can generate SQL script files
- Support for linked tables, and a built-in virtual range table
- Automatic re-compilation of prepared statements
- Sophisticated trace options
- Low memory requirements
- Easy to understand exception messages
- Standard handling of NULL values
- Multilanguage console application (at this time, English and German)
Currently, this is not traditional GPL software, but the source code is included. It is free for private and commercial use.
Enhancements:
- H2 now supports the PostgreSQL network protocol, and can be accessed using the PostgreSQL ODBC driver.
- Regular expressions are now supported.
- The per session undo log and referential integrity can be disabled.
- Default settings have been changed to save memory. NOT, boolean columns, and certain joins are optimized now.
- Part of the documentation has been translated to Japanese.

Wikidbase is an idea that combines the functionality of a database system and a wiki web application.
The wikidbase concept is based on the view that non-technical users of a database system (i.e. those who are the experts of the nature of the data they handle) should be able to create and evolve their database model over time (i.e. without paying a database expert over and over again to do it).
This is particularly relevant to non-profit and charity organizations.
Furthermore, since the designer of a conventional database system cannot foretell all future demands of the system, it is highly likely that a database model will be frozen too early, causing problems later on when the requirements of an organistion change - as they so often do.
A conventional database is a system for information storage and retrieval that is highly optimised through organisation of the data into a rigid model; as such, whilst being highly optimised, it is not easy for a non-technical user of the system to later change the model (e.g. to add or change fields, or tables), change reports and queries, or alter the data-entry interface.
A wiki is a website that allows non-technical users to easily edit the contents of webpages, allowing them to add images, alter styling, etc. A wiki can be likened to an unstructured database, since there is no predetermined modal for the information that will be stored, and so a wiki can be used to store highly flexible data - and lots of it - (wikipedia, a web wiki-based encylopedia, is a good example of this). Unlike a structured database, however, information held in a wiki can usually only be retrieved by string searches, and it is not possible, therefore, to retrieve structured information from the wiki (e.g. a list of phone numbers or email addresses for all staff members).
Wikidbase can be thought of as more than just a database, as a rich groupware application that will be capable of storing and organising all sorts of information (e.g. fully relational data, plain old information pages, files, images, media, semi-structured data, shared calendar type information, etc.). Wikidbase will be released as open source under the GPL licence (i.e it will be free).
Enhancements:
- Minor optimizations have been made and work begun on calendar-view enhancement and user authorization.
- The database model has been updated for future optimization.
- Some screencasts are available.

Sporniket Web Site System project is a set of PHP scripts that allow you to build and manage a Web site.

Two modules are available: Mini File Commander, a Web interface to manage files, and Cabbage, a system to quickly build a Website with organised content without using a database.

Web Foot Avio is a GDM theme based on wallpaper Blue Web Foot - Gnome.