PHP language is well known for us and we have not problems in using it. But for serious enterprise level web application we prefer to use Java and JSP language and using PHP mostly when customer need it, than by our own choice.

This is online proofreading solution created for proofreading of manuscripts created for publishing in Science magazines. Additionally to general English... 
This is specialized online spreadsheet application, created especially for ecological organizations. This spreadsheet structured by special way for such… 
VK Poems
This is the "" plugin application that allows to social network users to write short poems line by line. (One user can write one line at the moment).