ok here is one good list with shells

bsd_ia32_bind BSD IA32 Bind Shell
bsd_ia32_bind_stg BSD IA32 Staged Bind Shell
bsd_ia32_exec BSD IA32 Execute Command
bsd_ia32_findrecv BSD IA32 Recv Tag Findsock Shell
bsd_ia32_findrecv_stg BSD IA32 Staged Findsock Shell
bsd_ia32_findsock BSD IA32 SrcPort Findsock Shell
bsd_ia32_reverse BSD IA32 Reverse Shell
bsd_ia32_reverse_stg BSD IA32 Staged Reverse Shell
bsd_sparc_bind BSD SPARC Bind Shell
bsd_sparc_reverse BSD SPARC Reverse Shell
bsdi_ia32_bind BSDi IA32 Bind Shell
bsdi_ia32_bind_stg BSDi IA32 Staged Bind Shell
bsdi_ia32_findsock BSDi IA32 SrcPort Findsock Shell
bsdi_ia32_reverse BSDi IA32 Reverse Shell
bsdi_ia32_reverse_stg BSDi IA32 Staged Reverse Shell
cmd_generic Arbitrary Command
cmd_interact Unix Interactive Shell
cmd_irix_bind Irix Inetd Bind Shell
cmd_localshell Interactive Local Shell
cmd_sol_bind Solaris Inetd Bind Shell
cmd_unix_reverse Unix Telnet Piping Reverse Shell
cmd_unix_reverse_bash Unix /dev/tcp Piping Reverse Shell
cmd_unix_reverse_nss Unix Spaceless Telnet Piping Reverse Shell
generic_sparc_execve BSD/Linux/Solaris SPARC Execute Shell
irix_mips_execve Irix MIPS Execute Shell
linux_ia32_adduser Linux IA32 Add User
linux_ia32_bind Linux IA32 Bind Shell
linux_ia32_bind_stg Linux IA32 Staged Bind Shell
linux_ia32_exec Linux IA32 Execute Command
linux_ia32_findrecv Linux IA32 Recv Tag Findsock Shell
linux_ia32_findrecv_stg Linux IA32 Staged Findsock Shell
linux_ia32_findsock Linux IA32 SrcPort Findsock Shell
linux_ia32_reverse Linux IA32 Reverse Shell
linux_ia32_reverse_impurity Linux IA32 Reverse Impurity Upload/Execute
linux_ia32_reverse_stg Linux IA32 Staged Reverse Shell
linux_ia32_reverse_udp Linux IA32 Reverse UDP Shell
linux_sparc_bind Linux SPARC Bind Shell
linux_sparc_findsock LINUX SPARC SrcPort Find Shell
linux_sparc_reverse Linux SPARC Reverse Shell
osx_ia32_bind Mac OS X Intel Bind Shell
osx_ppc_bind Mac OS X PPC Bind Shell
osx_ppc_bind_stg Mac OS X PPC Staged Bind Shell
osx_ppc_findrecv_stg Mac OS X PPC Staged Find Recv Shell
osx_ppc_reverse Mac OS X PPC Reverse Shell
osx_ppc_reverse_nf_stg Mac OS X PPC Staged Reverse Null-Free Shell
osx_ppc_reverse_stg Mac OS X PPC Staged Reverse Shell
solaris_ia32_bind Solaris IA32 Bind Shell
solaris_ia32_findsock Solaris IA32 SrcPort Findsock Shell
solaris_ia32_reverse Solaris IA32 Reverse Shell
solaris_sparc_bind Solaris SPARC Bind Shell
solaris_sparc_findsock Solaris SPARC SrcPort Find Shell
solaris_sparc_reverse Solaris SPARC Reverse Shell
win32_adduser Windows Execute net user /ADD
win32_bind Windows Bind Shell
win32_bind_dllinject Windows Bind DLL Inject
win32_bind_meterpreter Windows Bind Meterpreter DLL Inject
win32_bind_stg Windows Staged Bind Shell
win32_bind_stg_upexec Windows Staged Bind Upload/Execute
win32_bind_vncinject Windows Bind VNC Server DLL Inject
win32_downloadexec Windows Executable Download and Execute
win32_exec Windows Execute Command
win32_findrecv_ord_meterpreter Windows Recv Tag Findsock Meterpreter
win32_findrecv_ord_stg Windows Recv Tag Findsock Shell
win32_findrecv_ord_vncinject Windows Recv Tag Findsock VNC Inject
win32_passivex Windows PassiveX ActiveX Injection Payload
win32_passivex_meterpreter Windows PassiveX ActiveX Inject Meterpreter Payload
win32_passivex_stg Windows Staged PassiveX Shell
win32_passivex_vncinject Windows PassiveX ActiveX Inject VNC Server Payload
win32_reverse Windows Reverse Shell
win32_reverse_dllinject Windows Reverse DLL Inject
win32_reverse_meterpreter Windows Reverse Meterpreter DLL Inject
win32_reverse_ord Windows Staged Reverse Ordinal Shell
win32_reverse_ord_vncinject Windows Reverse Ordinal VNC Server Inject
win32_reverse_stg Windows Staged Reverse Shell
win32_reverse_stg_upexec Windows Staged Reverse Upload/Execute
win32_reverse_vncinject Windows Reverse VNC Server Inject