* 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.

* Tabbed document interface * Drag-and-drop * Spell checker (Spell checker doesn't distinguish between text and code) * Supports text encoding formats such as Unicode, for international writing systems * Find and replace over multiple documents * Auto-completion * Bookmarks * Syntax highlighting and code folding * Brace and indent highlighting * Regular expression find and replace * FTP Browser (plug-in included in standard installation) * macro recording and execution. * File status auto-detection * Hex viewer * Zen Coding * Column selection