To chart structured programs, like ones written in C, however, PAD is much handier than flowchart. I once needed a program similar to this but had difficulty finding anything that didn't cost a lot of money. This C language program is perfect for intranets where you need to browse through a large directory structure. The source was originally posted in September, 1996. It's not a large program.
Many people also use their Web server program, httpd.
NCSA has just released their next generation tool, Habanero. Included, or planned, are all the networking facilities, routing, arbitration, and synchronization mechanisms necessary to accomplish the sharing of state data and key events between collaborators' copies of a software tool. A Java applet that sends e-mail directly from a WWW page. A Java applet that displays images and text floating around and bouncing. The images and text can contain links to jump to other places.