The free programs mentioned do work for remote assistance. However, you might also be interested in Microsoft’s Windows Intune
Cloud service which is designed to offer the unique opportunity for computers and users to operate at peak performance, from virtually anywhere.
I realize this is slightly different from the kind of product you were originally looking for, however it does bear some resemblance. For example, if you are someone who intends to manage end users (I.E. assist your brother) by logging in remotely to their machine you can do so from nearly anywhere bypassing the need for a VPN connection or domain access.
In addition to remote assistance through easy access as mentioned above, as the administrator you can remotely push updates to both local and remote users, secure PCs through the bundled endpoint protection, manage software distribution, and find yourself eligible for Windows upgrade rights. Mobile device management
will even be included in the next release of Windows Intune.
If you want to try it out and see if it will work for your needs, a 30 day free trial is available here
More detailed information about Windows Intune and its features it offers, including remote assistance, can be found here
Windows Outreach Team – IT Pro
The Springboard Series for Intune on TechNet