* The primary implementation as part of Plan 9 from Bell Labs (originally implemented in the Alef programming language, and later rewritten in C using libthread.) * Plan 9 from User Space port of most Plan 9 user space tools to *NIX systems. * Acme Stand Alone Complex (aka acme-sac) rewrite in Limbo to run on the Inferno virtual machine that can run as a standalone application on Plan 9, POSIX, or Microsoft Windows. * Updated build of pf9, reported to work on 64-bit Windows.

* a purely functional editor core * keybindings written as parsers of the input * Emacs, Vim and Cua (subset) emulations provided by default * Vty (terminal) and Gtk-based Pango UIs