Some other good free shells:
https://freeshell.de/ - you only need to send a postcard to Germany, irc is allowed
http://www.polarhome.com/ - lots of OSes to choose from: HPUX, AIX, GNU Hurd, OpenBSD, NetBSD, FreeBSD, Solaris, Minix, UnixWare, Solaris, QNX, Irix, Tru64, OpenVMS, Ultrix, OSX, ...