I just read about
an introduction of Wt, by Wim Dumon and Koen Deforche, available at Dr. Dobb's.
This library can let programmers write modern web applications using a familiar C++ GUI programming style. The interesting thing about Wt is it would renders the C++ applications to the web browser. The authors claimed that Wt supports AJAX and provides greater efficiency and a smaller footprint than Java or Ruby solutions. It seems like a good option for those who are comfortable with C++ GUI programming and would not invest extra efforts to switch to other languages. :-)
This library is released under a dual-license strategy (kind of similar to
Qt): one can choose GNU GPL (for free, of course), or a commercial license for a yearly subscription fee.