Cisco IOS Software Release 12.3(14)T supports Clientless and Thin Client:
clientless mode can provide secure access to private Internet resources and content. This mode is useful for accessing most content that you would expect to use within an Internet browser, such as Internet access, databases, and online tools that employ a Web interface.
Thin Client WebVPN (port-forwarding Java applet) extends the capability of the cryptographic functions of the Internet browser so that it can enable remote access to TCP-based applications such as POP3, SMTP, IMAP, Telnet, and SSH.
http://www.cisco.com/en/US/products/sw/secursw/ps2308/products_configuration_guide_chapter09186a008041b4f5.html