For MATE:
Wolfgang Ulbrich <chat-to-me@raveit.de

For GNOME:

Frederic Ruaudel <grumz@grumz.net>
Rodrigo Moya <rodrigo@mate-db.org>
Pierre Wieser <pwieser@trychlos.org>

based on nautilus-sendto module from Roberto Majadas <roberto.majadas@hispalinux.es>