Some examples of Using Perl and C Through your Web browser
Some random examples of perl including form submit, system calls, calling a c-program, and using both arrays and hashes.
An example of submitting a form to a C program using get method
Does the same as the previous example but uses the post method instead of the get method. Notice that in the post method there is nothing extra in the URL
Java Applet Example
This is a very quickly done example of putting an applet into a website. Note that I put the .class file into the same folder as the .html file displaying it. This program requires no other images to be in the directory, but some applets might use images. If so, they have to be in the same directory as the html page (or as specified by the specific applet in a readme file or on their website, etc)

A few other notes: