One thing to keep in mind is that gratis is not always libre -- "free" as in beer doesn't necessarily imply "free" as in speech. Unless you hold the copyright (and haven't assigned exclusive distribution rights elsewhere) and any applicable patents or licenses thereto, then your ability to redistribute depends entirely upon the license that goes with the software. And that software may already be subject to distribution channel agreements (iOS developers agree to use Apple's distro channel when they get the SDK -- it's a condition of that software license, and private distribution costs extra).
And, as Darkmere pointed out, it's just common courtesy to give credit where credit is due -- point to the official (home) site, even if you have permission to redistribute.