Mailman, Groups.io, Dialog Messenger, TidyHQ, GroupSpaces, Fleep, Discut, Usenet.net, Gaggle Mail, Astraweb, XS usenet, Framalistes, Bigtent, Ripcord, FreeLists, Mobilize, Librelist, Wiggio, Nabble, Listeron, Ziggs, MUUT, GroupServer, Discuss, GingerHQ, Minsh, OnlineGroups.net, Allt.in, BinTube Usenet Access, 6Tribes, Yahoo! Groups, My Town Circle, Skarpline, Mazey, Usenet Web Gateway are some alternatives to Google Groups.