Tools :
Internet, CVS, mailing-lists, IRC chat
Publicly accessible projects hosting platforms : SourceForge (http://sourceforge.net/), Savannah (http://savannah.gnu.org/), etc.
Projects structure
old-style traditional model : Cathedral
new unexpected style : Bazaar
See Eric Raymond's essay "The Cathedral and the Bazaar"[5]
[5] More detailed bibliography in appendices.