Launch is a menu for favorite applications and documents. Installing Launch creates a folder in the home directory called "Aliases". Any number of documents and shortcuts can be placed in there and arranged in a hierarchy of subfolders. At login, Launch scans this directory, and creates a menu in the status area from which these files can be opened instantly. There are no other options or features in the menu; just exactly what is found in "Aliases" at login and no more.
Perl modules are notated in many different formats: "Foo/Bar/Baz.pm", "Foo::Bar", "Foo-Bar", etc. Module-Format allows one to take a list of modules in any format (including mixed ones) and output it in a consistent format that can be input to an installation program or an information querier.
Redshiftgui changes the color temperature of your monitor to better match that of your surrounding. This means that it sets a cooler color temperature during the daytime (due to natural lighting) and sets a warmer temperature at night (due to indoor lighting). Similar to f.lux, this is a GUI port of the redshift project.