The xterm program is the standard terminal emulator for the X Window System. It provides DEC VT102/VT220 and Tektronix 4014 compatible terminals for programs that can't use the window system directly. If the underlying operating system supports terminal resizing capabilities (for example, the SIGWINCH signal in systems derived from 4.3bsd), xterm will use the facilities to notify programs running in the window whenever it is resized.
dvtm brings the concept of tiling window management, popularized by X11-window managers like dwm, to the console. As a console window manager, it tries to make it easy to work with multiple console based programs like vim, mutt, cmus, or irssi. dvtm is intended to be used where X11 isn't available or over SSH. In conjunction with dtach, it can be seen as a lightweight alternative to GNU screen.
spectrwm is a minimalistic tiling window manager that tries to stay out of the way so that valuable screen real estate can be used for much more important stuff. It has sane defaults and does not require one to learn a language to do any configuration. It was written by hackers for hackers and it strives to be small, compact, and fast.
GTK, which stands for the Gimp ToolKit, is a library for creating graphical user interfaces. It is designed to be small and efficient, but still flexible enough to allow the programmer freedom in the interfaces created. GTK provides some unique features over standard widget libraries.
TimeTracker puts up a list of projects, and the number of minutes worked on each. You click on the project you want to work on, and it starts counting on that. At the end of the day, it saves the collected data in a file, and you can use a script to process the data. The project has been idle for quite a while, and has spawned a host of imitations, including implementations of the same basic idea for Windows, PalmPilot, KDE, and various other contexts.
netview lets you browse, mount, and unmount SMB shares using any browser, but especially Konqueror or any browser which is also a file manager. It provides actual mounting of shares so you can edit files on them. It addes mounted shares to /etc/fstab automatically so they will be remounted, and manages storage of passwords in a $HOME/.smbpasswd file for later auto-mounting of shares.