Acme is a generic application, a text editor and a lot of other things in one window. Comes from plan 9. Uses the mouse a lot.
Links
In contrast to Emacs, Vim and so on, Acme makes heavy use of the mouse, even more: Without a mouse Acme is simply not usable (but this is also true for the complete Plan9 System). It takes some time for an oldschool keyboard jockey like me to embrace this new paradigm, but after i got it, i never want to go back. The basic controls are pretty much self explanatory, but there are a few "unconventional" naming conventions and functions normaly not available:
Put -> safe
Putall -> safe all buffers
Snarf -> copy
Zerox -> open a new buffer with the content of the current buffer
Newcol -> creates a new window
Del -> closes current window
The weird / funny / cool part is, that you can just type a new button anywhere... want to read your mail? Simply type "Mail" anywhere, click on it with the middle mouse button... and voila! A new window with your mailbox opens up. You want to take a screenshot? Easy: Just type cat /dev/window | tojpg > /tmp/acme.jpg, select it, middle click, and now you got a screenshot: