Soiled is a Flash-based telnet client and terminal emulator, supporting both char-by-char and line-by-line mode. In line-by-line mode, it has some features that make it suitable for MUDs, such as aliases, macros, and hotkeys. Since it is implemented in Flash, it can be used from a Web browser.
TinyShell AJAX is a tiny cross-browser module based shell that acts like a Unix prompt. It includes a MySQL command line client. It supports multi-line commands, tabbing, and much more. It is ideal for emulating SSH access to a webhotel that only offers FTP and HTTP access. Also, the application is fully functional on the native iPhone/iPad browser.