Free developing software for linux

Develop is a little Tool for Programmers.
You can use it for c++ html php and java.
There are little Generators for html / OpenGL / php.
You can create PDF / PS with highlighting support
Enhancements:
- better highlighting

Porcupine is a web application server that provides an object oriented framework for developing web applications rapidly.

Many of the tasks required for building web applications as you know them, are either eliminated or simplified. For instance, when developing a Porcupine application you dont have to design a relational database. You only have to design and implement your business objects as classes, using the building blocks provided by the framework (datatypes). Porcupine integrates a native object database, no mapping required.

Another tedious task for web applications is the interface design, and the constraints imposed by HTML. QuiX, the servers integrated XUL motor, simplifies the interface design process. All you have to do is describe your applications interface in XML and write the appropriate event handlers. You dont have to waste time and money on widget implementations. QuiX comes with a variety of ready to use widgets, accelerating the development process.

Generally, every Porcupine application consists of three distinct layers. The first is the business layer consisting of the business objects which encapsulate the business logic.
The second layer binds the HTTP protocol with the first layers business objects. This layer is implemented using Python Server Pages or Servlets. If using XML-RPC, one common approach is to directly map an XML-RPC method to a business objects method.
The third layer, the presentation layer, usually consists of XML UI definitions and JavaScript event handlers.

The first two layers are executed server side and the third layer is executed on the client (browser).

RVNDEV is a set of utilities to assist developers developing in Ravenous. The project is used by placing it in the root of the site being developed and setting Ravenous in development mode.
Enhancements:
- Support for configuration of data model caching was added.

Webware for Python project is a suite of Python packages and tools for developing object-oriented, web-based applications.
The suite uses well known design patterns and includes a fast Application Server, Servlets, Python Server Pages (PSP), Object-Relational Mapping, Task Scheduling, Session Management, and many other features. Webware is very modular and easily extended.
Webware for Python is well proven and platform-independent. It is compatible with multiple web servers, database servers and operating systems.
Enhancements:
- It contains some fixes and improvements of WebKit, and it adds some more configuration options that have been requested.

adevs is a C++ library for developing discrete event simulations based on the Parallel DEVS and DSDEVS formalisms.
DEVS has been applied to the study of social systems, ecological systems, computer networks and computer architecture, military systems at the tactical and theater levels, and in many other areas.
Recent advances in quantized approximations of continuous systems suggest promising computational techniques for high performance scientific computing (e.g. in the field of computational fluid dynamics).
Enhancements:
- This version corrects an error in the dynamic structure feature (this error only affected models that use component migration).
- A limited adevs-1.x backwards compatibility module is available.

virtbench is a set of benchmarks for virtualization environments / hypervisors. The project is designed to be easy to run and easy to extend. The main audience will be people developing hypervisors.

KDE Simple Programming Tutorial is a tutorial for developing a KDE application.

With the only requirement of a little C++ knowledge, and using the latest KDE snapshots, the reader will learn how to build his/her first KDE application from a simple "Hello world" button to a Web browser with a DCOP interface that communicates with a bookmark application running in a separate process.

Theres also a spanish and a romanian version of the documentation.

PXAServer project is a framework for developing Web applications. The core library eases use of Ajax, XML, Javascript, and PHP.
Enhancements:
- This release adds a login system with MD5 hashing and a flex2 client.
- It adjusts the log system for the login system, and fixes a minor bug.