A number of languages exist for developing web applications.
Here are the most popular ones. CMFL, commonly called Cold Fusion is a markup language that runs on JVM, Google app engine and .Net framework. MachII and WireBox assist this tool.
ASP.Net is a product by Microsoft to help developers in building websites, web applications and web services. Openrasta, MonoRail and DotNetNuke are additional tools for this program.
Python is a high end programming language that is assisted by BlueBream, Webware and web2spy. Ruby is a general purpose language and is assisted by Ramaze, Sinatra and Ruby on Rails. Perl is another general purpose high end programming language.
Some of the popular webapps for the web are: hoot suite, zootol, springpad, beanstalk, ceevee, procssor, xero, panda form, woorank and pdfmyurl.com