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Humble started out as bundling "Indie Games" usually some relatively well known and well regarded ones together with some lesser known titles. I believe they where the first to do so. They still do those "Humble Indie Bundles" (maybe 3 times a year?) and as far as I know all games in those Humble Indie Bundles are still provided DRM free, in quite a few cases even for the first time.
In recent years they branched out, there's a regular store selling both DRM free titles and Steam codes, they provide a website widget for devs to sell games on their own sites, and they do several bundles, including two console only bundles to date.
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