a tool that automates many onerous C++ programming tasks. It can save you a lot of time and make coding more enjoyable. Given a sequence of declarations Lzz will generate your header and source files. (Cool Idea, could be improved)
a program that examines source code and reports possible security weaknesses (``flaws'') sorted by risk level. It's very useful for quickly finding and removing at least some potential security problems before a program is widely released to the public.
a discrete event simulator targeted at networking research. Ns provides substantial support for simulation of TCP, routing, and multicast protocols over wired and wireless (local and satellite) networks