Proportional Font Terminal is a version of Ajaxterm hacked to use Web-optimized proportional fonts. This allows terminal users to have the same kind of proportional fonts that have all but displaced monospace fonts for mainstream Web use because they offer simply better usability.
Mintty is a terminal emulator for Cygwin and MSYS with a native Windows user interface and minimalist design. It is based on parts of PuTTY by Simon Tatham and provides xterm-compatible terminal emulation, but does not require an X server. Its features include a simple options dialog, Unicode support, fullscreen mode, drag & drop, and window transparency.
Libtermui is a terminal driver library. It is fully standalone and lightweight. It does not rely on termcap or curses libraries. It can drive terminals on a TTY or through a telnet connection directly on a TCP socket. It is fully re-entrant, and can be used to drive multiple terminals from different threads. It includes a getline feature (similar to the one in readline) and some console user interface facilities.
GNU Teseq is a tool for analyzing files that contain control characters and terminal control sequences. It is intended to be useful for diagnosing terminal emulators and programs that make heavy use of terminal features (such as those based on the Curses library). It is primarily targeted at individuals who possess a basic understanding of terminal control sequences, especially CSI sequences. However, by default Teseq will try to identify and describe the sequences that it encounters and the behavior they might produce in a terminal.