PHPFog is an excellent PaaS (platform as a service) that offers a free version with a limit of three apps. One of the apps they provide is WordPress. What is nice about this is that unlike the free version of WordPress.com, an installation of WordPress on PHPFog has no restriction on the themes, plugins, or other similar customisations you can perform. Backed up by their seemingly solid software stack/infrastructure, they offer an attractive option to host your WordPress blog for free. You can still get advanced reporting for free by using Google Analytics or WordPress’s JetPack which includes WP Stats.
I am strongly considering moving one of my blogs (perhaps this one?) to PHPFog.