Features

Automatic handling of window resizes.
Supports Unicode characters on output, automatically setting and resetting UTF-8 mode for xterm. Other terminals are assumed to support
Efficient output.
Minimizes repaint area, thus virtually eliminating the flicker problem that plagues ncurses programs.
A pure, compositional interface for efficiently constructing display images.
Automatically decodes keyboard keys into (key,[modifier]) tuples.
Automatically supports refresh on Ctrl-L.
Automatically supports timeout after 50ms for lone ESC (a barely noticable delay)
Interface is designed for relatively easy compatible extension.
Supports all ANSI SGR-modes (defined in console_codes(4)) with a type-safe interface.
Properly handles cleanup.

Known Issues

The character encoding of the output terminal is assumed to be UTF-8.
Minimal support for special keys on terminals other than the linux-console. (F1-5 and arrow keys should work, but anything shifted isn't likely to.)
Uses the TIOCGWINSZ ioctl to find the current window size, which appears to be limited to Linux and *BSD.

Uses terminfo to determine terminal protocol. Some special rules for Mac terminal applications. The special rules might be invalid on newer Mac OS.

None!