Ranger is a file manager with an ncurses interface. It is designed to give you a broader overview of the file system by displaying previews and backviews, dividing the screen into several columns. The keybindings are similar to those of other console programs like vim, mutt, or ncmpcpp, so the usage will be intuitive and efficient.
Bcvi is a tool that works with SSH to provide a secure "back channel" for sending commands back from the server to your workstation. For example, using bcvi and a shell alias, you can log into a server and type "vi filename". Instead of running vi in the terminal window, on the remote server, bcvi will send a message back to your workstation, where a listener process will invoke gvim (a GUI version of vim) and pass it an scp://... URL for the remote file. Bcvi has a plugin architicture that allows you to add support for any process you want to launch on your workstation by running a command on the server.
Viable is a plugin for the Eclipse environment that provides an interface as similar to vi (specifically Vim) as possible while maintaining access to all the powerful features of Eclipse. It supports visual block mode, common normal mode actions, command line mode (including command line history), "window" splits and management, regular expression search and replacement, and external filters and commands.