Conch is an SSHv2, Telnet, and VT102 implementation. It interfaces well with other Python projects such as Imagination, and includes an experimental console windowing library (Insults) and support for rudimentary line editing behaviors. A new implementation of Twisted's Manhole application is also included, featuring server-side input history and interactive syntax coloring.
Libptytty is a small library that offers pseudo-TTY management in an OS-independent way. It was created out of frustration over the many differences of PTY/TTY handling in different operating systems for use inside "rxvt-unicode". It also offers session database support (utmp and optional wtmp/lastlog updates for login shells) and supports forking a proxy process after startup and dropping privileges in the calling process. It offers C++ and C-only APIs.
GreenT is a Linux terminal emulator written in C#. Its visibility can be toggled by a hotkey just like the consoles found in games. Additionally, it supports tabs like gnome-terminal. It uses gnome-terminal's settings for its configuration which it updates in real-time when changed in gnome-terminal.
krd eases the configuration and utilization of multiple connections to remote desktops. It's a rdesktop and VNC wrapper. You can configure almost all rdesktop and xtightvncviewer parameters and copy/paste/rename connections. It stores passwords safely with kwallet. You can save/manage sessions very easily using a menu. It supports preinit and postend scripts per connection, typically to start or stop SSH tunnel or VPN connections.