can anyone give me names of some popular open source software projects?

There are tons of open source projects out there. Stuff like Linux, Apache are really popular. You can check out sourceforge.net and freshmeat.net for projects.

I just have one issue. Aren’t you supposed to be displaying projects that you have made, and which are open source. If it is an exhibition where you are just displaying various projects that are there already, the above approach will work. Else, it is time to put your head down and start coding. May the source be with you..