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.
Ion is a tiling (no overlapping windows) window manager that also has PWM-style tabbed frames which can contain multiple client windows. These features help to keep windows organized and to switch quickly between them. Ion was designed primarily as an efficient and unobtrusive window manager for users who prefer the keyboard.
awesome is a highly configurable, next generation framework window manager for X. It is very fast, light, and extensible. It is primarily targeted at the power user, developer, and anyone dealing with everyday computing tasks who wants to have fine-grained control over a graphical environment.
wmii is the next generation of wmi. It is a highly customizable keyboard-and-mouse-driven X11 window manager that supports conventional, tabbed, and tiled window management with low memory usage and vi-like user interaction. Due to a complete rewrite, it is highly modularized and uses a new configuration and inter-process communication interface, which is oriented on the 9p protocol of the Plan9 operating system.
X Persistent Remote Applications (xpra) is "screen for X". It lets you run applications remotely (like ordinary X or VNC), but unlike ordinary X, these applications are "persistent" if you lose your connection, or even if you want to switch to another computer. Also unlike VNC, they are ordinary applications on your desktop managed by your window manager, not trapped in a box.
dwm is a fast and simple window manager for X11. It manages windows in tiled and floating layouts. Either layout can be applied dynamically, optimizing the environment for the application in use and the task performed. Windows can be tagged with one or multiple tags. Selecting certain tags displays all windows that are accordingly tagged. dwm is the little brother of wmii.
IceWM Control Panel is a full-featured, GTK-based control panel for IceWM. It features an IceWM theme designer, Ice Sound Manager (for sound events), IcePref2, and tools to manage desktop wallpaper, cursors, keys, window options, and more. IceWM Control Panel has a familiar, Windows-like Control Panel user interface.
subtle is a grid-based manual tiling window manager with a strong focus on easy but customizable look and feel. In comparison to other tiling window managers, subtle has no automatic tiling of the screen size in any way. Instead, windows are arranged according to positions inside of a grid. These positions are called gravities.
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).
Terminal is a modern terminal emulator for the Unix/Linux desktop, primarly for the Xfce desktop environment. It was developed because Xfce needed a lightweight and easy-to-use terminal emulator that didn't require the user to install the GNOME libraries, but still provided a worthy alternative to the GNOME terminal emulator, with all the bells and whistles.