Writing efficient user interfaces is the main maxim, here at Vimperator labs. We often follow the Vim way of doing things, but extend its principles when necessary.
Towards this end, we've created the liberator library for Mozilla based applications, to encapsulate as many of these generic principles as possible, and liberate developers from the tedium of reinventing the wheel.
Currently, these applications are using this library:
Vimperator, the flagship project from Vimperator labs, creates a Vim-like Firefox.
Vimperator is a
browser extension with strong inspiration from the
text editor, with a mind towards faster and more efficient browsing.
It has similar key bindings and you could
call it a modal web browser, as key bindings differ
according to which mode you are in. For example, it has
a special Hint mode, where you can follow links
easily with the keyboard only. Also most functionality
is available as commands, typing
Muttator is to Thunderbird what Vimperator is to Firefox. Combines the best aspects of Vim and Mutt.
Muttator is a free add-on for the
mail client, which makes it look and behave like the
Vim text editor.
It has similar key bindings and you could call it a modal mail
client, as key bindings differ according to which mode you are in.
For example, it the same keys can select the next message while
the message list has focus or can scroll down an existing message
when the message preview is selected. It also adds commands for
accessing most Thunderbird functionality. E.g.,
Instantbird or Sunbird to make use of our liberator library, feel free to contact us.