gdevilspie is a neat little GTK+ app that serves as a frontend (GUI) for devilspie2 that makes all sorts of detailed manipulations on windows very easy. In general, it is used by creating a new rule, describing what you want to manipulate and how it should act. Details can be found under Links, below.
MX Repo Manager is released under the GNU GPL v. 3 license, whose full text can be found both online and onboard. The core statement is as follows:
This tool greatly simplifies the process of changing the package repositories that are use for updating/upgrading and installation. For a general background on repositories, consult Section 5.2 of the relevant Users Manual.
The sources are set during installation depending on the selected timezone and language, and will generally work well. But there are many instances where a user might wish to change those selections.
On this page:
The mirrors listed below are tracking the following upstream sources on a 12h cycle:
I think apt-notifier could use a "check for updates" function in the right-click menu that does a apt-get update or whatever.