FontMeister is aimed at being the easiest way to access your fonts across different providers. It lets you maintain your own font stack using fonts from:

Support for additional providers is being added soon:

FontMeister lets you control which selectors you want to apply your fonts to, whether you want to selectively load certain font variants / subsets and for users of Suffusion, as a bonus you also get this integrated with the back-end font list. In other words, fonts added via FontMeister will show up in the drop-down lists in the Typography section of Suffusion’s settings.

Like all other code on this site FontMeister is distrbuted under the GPL v3 license.