DiGi WWW Server is a webserver. It supports access control, virtual folders, multiple ports. It has plugins for PHP and SSI. The server can run as a user-friendly GUI application and as an NT service. For more information see: http://wwwserver.sf.net/
Jane2chLovely is an Open Source and Free Browser for 2ch, which is a major BBS in Japan.
Dev-C++ with wxWidgets designer
wxDev-C++ is an opensource wxWidgets Dialog designer that mimics the Delphi/Borland C++ Builder designer.