Texifier includes a repository of generic LaTeX packages that are managed by its Bundle Manager, which will allow users to install almost any standard LaTeX package. Instead of installing gigabytes of packages and fonts, you can select just what you will need from a list of bundles.
As is customary with TeX, TexpadTeX automatically opens and typesets the LaTeX packages (.sty and .cls files) that are placed in the current directory of a LaTeX document.
That said, some users will want to install their own packages, or otherwise make a single file available to multiple documents.
The Windows variant of this article will be updated in due course. To try out Texifier for Windows before it is publicly released, please sign up for a beta.