Semantic Technology: SPARQL Demonstration
Here is a SPARQL Query Form demonstrating the use of a simple RDF graph and query engine.
Web CGI Programs for the PiDP-11
On an unrelated note, I enjoy working with historical computing platforms. I've linked a couple of web programs that use an open source HTTPD. The programs run on the PiDP-11, an excellent replica of the PDP-11. Each program, written in C and using CGI, compiles and runs on the 2.11 BSD OS.
Here is a Dr. Nim Game and IPv4 address calculator.
The source code for these projects is available on GitHub: 2.11 BSD HTTPD and 2.11 BSD Dr. Nim.