The analogue to Add/Remove porgrams in Ubuntu is USC - Ubuntu software center, which You can start from Your "main Ubuntu" menu. Which is dash in 12.04 and Gnome panel in previous versions. Also in previous versions there was Synaptic package manager, which was something like install/remove utilities and libraries from windows.
Also there is apt (Advanced Package ... something :p) which is very advanced command-line tool for installing applications and other software. (In previous versions also aptitude and dpkg are present)
So if You need to uninstall some package or app, that You know by name, try:
sudo apt-get remove packagename
or try to find it in Ubuntu Software Center, and click uninstall.