Werc is a minimalistic RESTful Web application framework and content management system. It follows the Unix "tool philosophy" and it is designed to be fast, simple, convenient, and easily extensible. It handles both small and big sites and has a flexible system for user and group permissions. All data is stored in plain text files that can be easily manipulated with standard tools, without using any databases or other external dependencies. Existing applications include a blogging engine with RSS/Atom feeds, a wiki system that can easily integrate pre-existing documents (can be enabled for any directory tree), and others.
Apache Click is a modern JEE Web application framework, providing a natural rich client style programming model. Apache Click is designed to be very easy to learn and use, with developers getting up and running within a day. It also supports automatic component rendering, client/server side validation, full localization, and multiple template engines (currently Velocity, JSP, and FreeMarker).
Sight is a Java Web framework built on top of J2EE technologies, and particularly on top of the servlet API. SightWF provides a simple programming model for building RIA applications. SightWF is initially designed to be deployed on Google App Engine, and can be run in a J2EE servlet container such as Tomcat.
Butterfly Web UI is a component based Java Web application framework. Like the rest of the Butterfly Components, Butterfly Web UI is extremely small and very flexible. Butterfly Web UI uses Butterfly Container internally, a state of the art dependency injection container. Using Butterfly Web UI, it is easy both to generate HTML for a Web browser or XML or JSON for a RIA frontend (Flex, JavaFX, Silverlight) or AJAX frontend. You also can easily create HTML layout templates that are reused throughout your Web application, so you don't have the layout hardcoded into every page. You can easily mix RIA and non-RIA Web application technology in the same Web application.
modu is a high-level toolkit for building database-driven Web applications in Python. It provides all the common components needed to build custom Web applications in Python, including form generation, object-relational database mapping support, pluggable template systems, database-resident session and user support, and more.
Mojolicious is "Duct Tape For The HTML5 Web". It is powerful with no dependencies out of the box with RESTful routes, plugins, Perl-ish templates, session management, signed cookies, a testing framework, a static file server, I18N, first class Unicode support, and much more. It has a very clean, portable, and object oriented pure Perl API without any hidden magic and no requirements besides Perl 5.10.1. It has a full stack HTTP 1.1 and WebSocket client/server implementation with TLS, Bonjour, IDNA, Comet (long polling), chunking, and multipart support. It has a built-in async I/O Web server supporting EV pluggable event queue, Unix domain sockets, and hot deployment, perfect for embedding. Automatic CGI, FastCGI, and PSGI detection for any deployment situation. It has a JSON and XML/HTML5 parser with an advanced CSS3 selector support. The code is based upon years of experience developing Catalyst.
Genit is a framework that builds a static Web site, which does not require a server side programming language or database. Generated sites consist only of XHTML code (plus CSS and media). It runs from the command line, is based on XML, and is designed to be simple, readable, and minimalist.
Elefant is a full-featured, but refreshingly simple CMS and PHP Web framework. It features an intuitive, streamlined admin interface, a tightly integrated WYSIWYG editor, dynamically embeddable content objects for building dynamic Web sites without touching code, and an extremely fast, secure, and flexible framework for add-ons and themes. The core CMS includes page editing, a blogging engine, site navigation, file and user management, automatic version control, a tool for translators and multilingual site management, and an in-browser theme/layout editor. It is also extensively documented and has a small but friendly and active developer community.