SSH for SymbianOS
See also Java MIDP-based implementations, as (to my knowledge) all Symbian-based devices support that API. At minimum, Nokia models using Symbian Series 60 aka S60 OS, Nokia models using Symbian Series 80 aka S80 OS, Sony Ericsson, and Motorola do.
When acquiring native-SymbianOS applications, it appears that one must be careful to match the sub-variety of one's OS. Those include SymbianOS v. 6.0/6.1 (Nokia 9210); multiple SymbianOS 7.0/7.0s variants including UIQ (Sony Ericsson P800, P900, P910, P990, W950, M600, P1, W960, Motorola A925, A1000, RIZR Z8, RIZR Z10, DoCoMo M1000, BenQ P30, P31 and Nokia 6708), Series 80 (Nokia 9300, 9500), Series 90 (Nokia 7710), Series 60 (Nokia 3230, 6600, 7310, 7650, 3650, 3620/3660, 7610, 6670, 6620, 6630, 6680, 6681, 6682, N70, N72, N73, N75, N80, N81, N82, N90, N91, N92, N93, N95, E50, E51, E60, E61, E62, E65, E70, N-Gage, N-Gage QD, Siemens SX1, Sendo X, Panasonic X700, X800, Samsung SGH-D730, SGH-D720, SGH-Z600); SymbianOS 8.0; SymbianOS 8.1; SymbianOS 9.1 variants including S60 platform 3rd Edition (Sony-Ericsson M600 and P990); SymbianOS 9.2 (Nokia N75, Nokia N76, Nokia 6120 Classic, Nokia E90, Nokia N95, Nokia 5700, Nokia N81, Nokia E51); SymbianOS 9.3. I am uncertain about the extent of forwards and backwards compatibility, so check device support.
SSHield by TeamF1, Inc., is an OpenSSH port to VxWorks, supporting sftp along with scp/ssh, numerous hardware accelerators, port forwarding, Protocol v. 2.0 & 1.5. Client and server. Proprietary.
Iconfident SSH by Icon Labs is a small, fast SSH server and client primarily for embedded use. Proprietary software available in source and binary forms. ssh protocol v. 2.0 & 1.5.
NanoSSH by Mocana Corp. is a small, fast ssh server and client primarly for embedded use. Also does telnet-ssl, tunneling, port forwarding. Extensible. Proprietary, binary-only software. ssh protocol v. 2.0. Formerly offered as Mocana Embedded SSH Server and Mocana Embedded SSH Client.
PuTTY by Simon Tatham is an SSH & telnet client, ported to SymbianOS on S60, Series 80, and Nokia 7710 devices by Petteri Kangaslampi, except that network code, noise generation, and storage implementation borrow heavily from SyOSsh by Gabor Keresztfavli. Taneli Leppa has also further ported Kangaslampi's work to UIQ version 3-based devices (e.g., Sony-Ericsson's P990i, M600i, and W950 devices). Rober Horvath has added support for UIQ version 1-based devices (Sony-Ericsson's P910i, P900, and P800, A1000, A925, etc.). MobilEyes AB (acquired by HiQ International AB in 2007) added support for UIQ version 1 and 2-based devices, but that work appears to have vanished from the Internet. Can use public keys created on a workstation by Simon Tatham's PuTTYgen. Source & binaries under a free-usage (MIT) licence. ssh protocol v. 2.0 & 1.5.
Mobile SSH by OpenResearch is an SSH client, based in part on PuTTY, and certified for UIQ version 2 devices such as Sony-Ericsson's P800i, P800, and P900. Proprietary, binary-only software. ssh protocol v. 2.0
Mocha Telnet by MochaSoft is an SSH client for S80 devices such as Nokia 9300 and 9500. Elsewhere on the Internet (other than MochaSoft) you can often find downloadable copies of what appear to be discontinued releases for Series 60 devices (such as Nokia 3600/3650/6600). Proprietary, binary-only software. ssh protocol v. 2.0.
SyOSsh by Gabor Keresztfavli is an SSH client based on PuTTY for a limited number of Symbios OS variants: EPOC Release 5 aka ER5 aka Symbian OS 5 (Psion Series 5mx, Series 7, Psion Revo, Diamond Mako, Psion Netbook, netPad, GeoFox One, Oregon's Osaris, and Ericsson MC218), Symbian OS 6.x aka ER6 (Nokia 92x0), and possibly earlier Psion Series 3 devices running the EPOC16 or EPOC rel. 1-3 software releases. Project appears to have stalled at v. 0.3 alpha stage, in 2002. Source & binaries under a free-usage (MIT) licence. ssh protocol v. 2.0 & 1.5.