Пожалуй то что надо - NAssi от ввв.gracebyte.com/nassi:
NETWORK ASSISTANT 3.2 - a real-time
communication utility for the office
environment, including channels-based chat,
shared whiteboard and instant messaging. It
does not require a dedicated server and may
be used instead of old good WinPopup. In
addition, it features file transfers, remote
processes control, remote screenshots, remote
activity tracking and more.
Единственный недостаток - платная. Зато можно и на русском, и банить, и менять нежелательные слова на $#@#$ или <вырезано цензурой>
