Free dynamic web applications software for linux

WAG Applications provides a collection of WAG-hosted Web applications.
WAG Applications is a collection of Web applications that are capable of being hosted by the Web Application Gateway.
WAG provides core functionality such as user definition, authentication, and administration, for all hosted Web applications.
Enhancements:
- Added application specific handlers to the wagErrorHandler function.
- Added is_email() function to functions.php which checks if a a given e-mail address is valid. It checks for all top level domains including the new ones (.biz, .info, .museum etc.) and the special ones (.arpa, .int etc.) as well as with e-mail addresses based on IPs (e.g. webmaster@123.45.123.45). (Function derived from PHP user contributed notes.)
- Enhanced the error reporting for both WAG and application database errors to include the server name and user name/id. This will help admins target problems if they are responsible for multiple WAG installations.
- Added "Date Added" and "Date Last Login" information to Administration > Users screen.
- Made style sheet changes related to form field fonts.
- Bug Fixes
- Validation of user e-mail addresses was not performed correctly and causing any valid e-mail address to be flagged as invalid.
- When admin changes a users password, the e-mail password, if configured, is also changed. This allows the admin to "lockout" a user from both WAG and e-mail if needed.

Echo is a framework for developing object-oriented, event-driven Web applications.
Echo removes the developer from having to think in terms of "page-based" applications and enables him/her to develop applications using the conventional object-oriented and event-driven paradigm for user interface development.
Knowledge of HTML, HTTP, and JavaScript is not required. Echo is open-source software distributed under the terms of the Mozilla Public License or the GNU LGPL License.
Enhancements:
- Version 1.1.4 adds support for specifying the order of tab-based navigation of components. The release also fixes bugs reported in previous versions, including the issues discovered with setting component focus.

Calyxo Web Application Framework encourages in MVC model 2 based web application development.

It offers support for true modular applications, i18n, a flexible view manager, a powerful validation engine, and more! Calyxo is entirely written in Java and builds on the latest Servlet and JSP technologies.

The Calyxo project divides into several components

Calyxo Base - this component collects some of the basic, reusable classes used throughout all the other components. It introduces basic concepts like modules, i18n, accessors and so on...

Calyxo Control - this component implements the Calyxo controller. Calyxo uses an approach similar to Struts here, so Struts users should feel familiar with Calyxo from the start. Calyxo Control may be considered as the "main part" of the Calyxo platform.

Calyxo Forms - this component allows the definition of forms, along with all their validation steps and lets you map inputs to properties of a data object. Complex validations, dependencies between inputs and mapping an input to a set of properties are supported. The Calyxo Forms JSP tag library provides replacements for HTML elements related to forms.

Calyxo Panels - this component allows the definition of pages in a container/component manner. Pages are dynamically composed from a tree of page fragments. Panel definitions may be nested to arbitrary depth and may use inheritance.

Calyxo Struts - this component focuses on integrating Calyxo parts into the very popular Apache Struts framework. The Calyxo Panels and Calyxo Forms components may be used with Struts to replace Struts Tiles and the Struts Validator.

The Horde Application Framework is written in PHP, and provides the common tools a Web application requires: classes for dealing with preferences, compression, browser detection, connection tracking, MIME, and more.
The Horde Framework does not provide any significant end user functionality and it provides a base for other applications and tools for developers. You will probably want to install some of the available Horde applications, such as IMP (a webmail client), or Kronolith (a calendar).
Enhancements:
- This is a security release that fixes a cross site scripting vulnerability and improves protection against phishing attempts.

Bulk Meter Flow and Operations provides a Web-based application to manage water meter readings.

phpWebApp is an application framework which makes easy and simple the task of building PHP web applications based on relational databases. It separates the task of designing and changing the layout of the application from the task of implementing the logic of the application, by using XML templates that are an extension of XHTML.
The project also simplifies the task of implementing the logic of the application by offering an event based programming model. In addition, phpWebApp tries to offer modularity and code reusability to the community of webApp developers.
Main features:
- The framework separates the layout from the logic of the application, so a graphical designer can easily improve the layout of the application without getting messed with the logic and without having to understand it. It makes easier the work of both the graphical designer and the programer. This also facilitates an iterative and incremental development approach for web application projects.
- The framework gives the possibility to divide a page into several parts which can be used in other pages as well. This makes the user interface of the application (the layout, the graphical part) more structured and easier to understand and maintain and makes easier the work of the graphical designer.
- The framework looks at web applications from a new point of view. From this point of view, a web application is a state machine, which can be represented and described by one or more statechart diagrams. Each page of the application that is displayed, represents the application in a certain state. Clicking to a link causes a transition to another state of the application. This simplifies the design and the implementation of web applications. Later, if this point of view is formalised and elaborated enough, it may provide the theoretical bases for automatic code generation of web applications from state chart diagrams (e.g. from UML state chart diagrams), and for reverse engineering.
- The framework supports an event based programing model. When a transition from one state of the application to another happens, it may trigger an event as well, which is handled by a function (event handler). This makes the logic of the application easy to build, understand and maintain, and makes easy the work of the web programer.
- The framework gives to the web programers the possibility to create independent web components (called WebBox-es) which have their own user interface (graphical design), client side behaviour, server side behaviour, states, events, event handlers, etc. These components can be very easily reused in other web applications and thus provide code reusability to web programers. This means that if you have constructed something once, you dont have to re-construct it again when you need it another time, but use it ready.
- The framework brings closer the client-side and the server-side logic of a web application. E.g. the session variables (which are usually used to keep the state of various parts of the application), are available and can be accessed both on client side and on server side.
- The framework makes the interaction with the database almost database independent. This means that in case that you decide to change the database on which your application is based (e.g. switching from MySQL to Oracle), then the application itself doesnt need to be changed at all, it will work all the same.
Enhancements:
- Bugfixes and some improvements in documentation were made.

Twisted Web includes an HTTP/1.0 protocol implementation for both servers and clients. Twisted Web also includes a resource framework for implementing rich, dynamic web applications. It includes support for authentication either via HTTP AUTH, session URLs, or session cookies.
It supports CGIs and a custom PB-based distribution mechanism for serving content from separate, persistent processes. It includes SOAP and XML-RPC support for both clients and servers. It also makes it particularly easy to deploy new servers with novel or ephemeral use-cases, often with only a single short command.
Enhancements:
- This release adds HTTP Basic auth support for XML-RPC clients, and fixes several date, time, and If-Modified-Since header parsing corner-cases.
- Various performance improvements have been made, and support for CGIs broken in a few specific ways has been improved.