JCurses, a java console windowing toolkit for Windows and Linux
The Java Curses Library (JCurses) is a library for developing text terminal based applications using Java programming language. It is implemented as a Windowing toolkit similar to AWT, but built upon the UNIX "curses" windowing system.
SWAL is a program that can launch as a service (or standalone) and monitor other services and control other programs. Written in C++ and might have some .NET components (planning on a linux port)
tcp2com creates a bridge between a TCP socket and a serial port (COM). The program runs as a service under Windows NT. With tcp2com, you can telnet into any device you may have plugged into your COM port.
CCE let you display and input Chinese/Japanese/Korean/UTF8 in many OS: Linux *BSD Solaris LynxOS QNX SCOUnix Minix Hurd BeOS Windows Darwin MacOSX. It supports console(framebuffer/VGA) & X11(through GGI/SDL), bitmap/TrueType fonts and many input methods.