i3 is a dynamic tiling window manager. Its key features are correct implementation of Xinerama (workspaces are assigned to virtual screens, and it does the right thing when attaching new monitors) and XrandR support (which is still unfinished). Both horizontal and vertical columns can be used in tiling. There is a special focus is on writing clean, readable, and well documented code. i3 uses xcb for asynchronous communication with X11, and has several measures to be very fast. i3 is primarily targeted at advanced users and developers.
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.
wmnetload is a network interface monitor dockapp for Window Maker. It is designed to fit well with dockapps like wmcpuload and wmmemmon. It tracks whether the interface is functioning and displays current network interface throughput, along with an auto-scaling graph of recent network activity (the graph separates upstream and downstream traffic load cleanly without resorting to colors).
WMI is a lightweight window manager for X11 which attempts to combine the best features of larswm, ion, evilwm, and ratpoison into one window manager. It supports both the conventional way of managing windows in a overlapping manner and the screen-alike way of managing windows in a non-overlapping fashion.
GNOME Clipboard Manager (GCM) makes copying and pasting easier and more productive. It will automatically synchronize the mouse selection (the primary selection) with the clipboard (the clipboard selection) and store the contents of the clipboard, making it possible to go back to a previous clipboard. You can save and load clipboards, edit them, and convert them to another format.