www.joomla.orgIt's an open source content management system - you (and other users) can write articles basically into a work-processor-type interface. It also manages the look and feel and there are loads of templates out there which instantly change the look and feel and are totally customisable.
We were looking at systems costing £10k in work, but Joomla was at least as good as those and there are about 2000 add-in components available to extend it.
Any Linux hosting package
will should have cPanel on it, which will install Joomla automatically when asked. You then customise the install to make it look and feel how you want. As it's free I can set up a vanilla install for you to have a play with on my webspace, if you want.