Yes, Ancestry.com owns Rootsweb. There are a dozen or so other genealogy sites but none are indexed by public search engines.
All major genealogy programs can produce web pages that you can easily upload to your own site. I use Ancestral Quest, the successor to AFT.
Even if you create your own website you should upload your GEDCOM to Rootsweb and even Ancestry.com so users of those sites can find your data.