TeamViewer is free for non-commercial use. If you use it at the office, you probably need to buy the base license which is $750.
LMI Free and Remote Desktop are free to use commercially on the other hand. I still have no idea how LMI still offers LMI Free for commercial use. Central is a great value for IT people too. I have over 100 computers on my LMI Central. But I still think Remote Desktop is better suited for work-related activities.
I use both continuously on a daily basis.