TomP2P!

PHP (version 4 or 5) framework with a thin model layer. Includes an ActiveRecord class for database agnostic (mostly) data retrieval. Good community support in its forums.

Ruby on Rails is an open source full-stack web application framework for the Ruby programming language. Rails is a full-stack framework, meaning that it gives the Web developer the full ability to gather information from the web server, talking/querying the database, and template rendering out of the box.

Symfony is a set of reusable PHP components and a PHP framework for web projects.

Extending the art & spirit of PHP, Zend Framework is based on simplicity, object-oriented best practices, corporate friendly licensing, and a rigorously tested agile codebase. Zend Framework is focused on building more secure, reliable, and modern Web 2.0 applications & web services, and consuming widely available APIs from leading vendors like Google, Amazon, Yahoo!, Flickr, as well as API providers and cataloguers like StrikeIron and ProgrammableWeb.

Yii is a high-performance component-based PHP framework best for Web 2.0 development.Yii comes with rich features: MVC, DAO/ActiveRecord, I18N/L10N, caching, authentication and role-based access control, scaffolding, testing, etc. It can reduce your development time significantly.

Agile Toolkit is a PHP framework for developing Web User Interfaces. Inspired by desktop GUI it provides a full object-oriented foundation for Business and Presentation logic of your web software. Agile Toolkit is notable for it's simple of use and development efficiency.

Fuel is a simple, flexible, community driven PHP 5.3 web framework based on the best ideas of other frameworks with a fresh start and a design pattern in HMVC.

FAT-FREE is a powerful yet lightweight PHP 5.3+ Web development framework designed to help you build dynamic and robust applications - fast!

Grails is a high-productivity web framework based on the Groovy language that embraces the coding by convention paradigm, but is designed specifically for the Java platform.

Silex - The PHP micro-framework based on Symfony2 Components

The ASP.NET MVC is a framework for building scalable, standards-based web applications using the model-view-controller (MVC) pattern and the power of ASP.NET and the .NET Framework .