It depends on what you want to do, but I use TeamViewer, which works with Windows, Mac OS X, Linux, Ubuntu, iPhone, iPad, etc. It's very secure and quite simple to set up and use.... and it's free.
It depends on what you want to do, but I use TeamViewer, which works with Windows, Mac OS X, Linux, Ubuntu, iPhone, iPad, etc. It's very secure and quite simple to set up and use.... and it's free.