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Attribute::Property -- Easily make accessors to object properties. (co-authored with Juerd)
B::More -- Adds additional functions to B, and is mostly obsolete in more recent versions of Perl.
Data::Alias -- I have a separate page about this.
Data::Swap -- Quickly swaps the contents (and even type) of two variables.
Data::XDumper -- A better data-structure dumper. In some need of revision.
Sub::Name -- Assigns a (new) name to a sub, for debugging purposes.