A fuzzy window switcher for Ubuntu (GTK based, so should work in other distros too, but I haven't tested). It shows you a list of open windows and uses Python's difflib to sort them according to your input. Pressing enter opens the window at the very top.
The version previously in the repository had some bugs, primarily with the focusing issue and the choice of the activation shortcut. (This was still a WIP, and I wasn't aware that people have started playing around with it)
The focusing issue is fixed, and a configuration file is now used to override settings.
The application needs KeyBinder 3 installed, which you can install using your distro's package manager.
After the application has started running (you can run it on startup), just press the hotkey (F10 by default) to show the list of applications currently open. Start typing some letters, and the most relevant window will rise to the top. Clicking Enter would now switch focus to that window. You can press ESC to cancel the operation and hide the Fuzzy Windows window again.
The hotkey is configurable (see the config section).
Apart from this, you can also double-click on any window to open it.
The default hotkey is F10. You can change this by creating a .fuzzy-windows file in your home directory. The contents would be something like:
[DEFAULT]
hotkey=F9
Certain windows are ignored and not shown to you, because they're common system specific ones. The default ones ignored are: 'XdndCollectionWindowImp', 'unity-launcher', 'Desktop', 'unity-panel', 'unity-dash', 'Hud', 'Guake!'
You can, however, override this as:
[DEFAULT]
hotkey=F10
ignored_windows=
unity-panel
unity-dash
Notice that the list is newline separated.
Still thinking. Your suggestions are welcome. Just open a new issue here on GitHub.