Critical GNT

Many of us don't have access to a critical edition of the Greek New Testament—at least not the Novum Testamentum Graece edited by Nestle and Aland.  The Society of Biblical Literature has provided one free of charge in partnership with Logos Bible Software at their website.  It comes in a variety of formats that are compatible with most Bible software packages today.  For those interested in variants in NT readings, it's a helpful resource, if not quite as complete as the standard critical text today.  And it's hard to beat free.