From Tetra Informatica:
BD4 Soporte is remote control software which allows you to interact with a remote computer.
It is written in Java, so It is platform-independent. It is tested on Windows, Mac OS X and Linux.
It has a file transfer running on all platforms.
Network connection is compressed and encrypted.
There are two connection types: direct and reverse.
Direct connection is when the client connects to the server.
Reverse connection is when the server connects to the client. It is very useful because of your customers don't need to open any port.