I have created a mini-Mudlet that runs on Windows, Linux and OSX.  It has no commands and isn't a server manager but is intended as a replacement to Putty and other raw telnet clients.

You can download it here.

It displays all game chat in a new window, filters out most of the telnet lines that you don't need to see, logs the chat to daily text files and logs the raw telnet data to text files.  It includes buttons for saving the