Joe,
My references are unfortunately in French but you will find quite a lot of pictures and plenty of information by following the provided links. :-x
The first machine-gun would be a French - Saint Etienne Model 1907T (T for transformed)
see :http://www.mitrailleuse.fr/France/StEtienne/StEtienne.htm
Specs : http://www.mitrailleuse.fr/France/StEtienne/1907T/StEt1907.htm" onclick="window.open(this.href);return false;
Pictures : http://www.mitrailleuse.fr/France/StEtienne/gallerie/STEgallerie.htm" onclick="window.open(this.href);return false;
The second machine-gun would be a German - MG08
see : http://www.mitrailleuse.fr/Allemandes/Mg08/MG08.htm" onclick="window.open(this.href);return false;
MGA and MGK : http://www.mitrailleuse.fr/Allemandes/Organisation/Organisation.htm" onclick="window.open(this.href);return false;
The HotchKiss is on the third picture
see : http://www.mitrailleuse.fr/France/Hotchkiss/Hotchkiss.htm" onclick="window.open(this.href);return false;
I hope this will help and let me know if 'google-translate' gets limited... #-o