When comparing Freesound vs GameMaker:Studio Marketplace, the Slant community recommends Freesound for most people. In the question“What are the best sources of royalty free game assets?” Freesound is ranked 5th while GameMaker:Studio Marketplace is ranked 10th. The most important reason people chose Freesound is:
All assets made available through Freesound are required to be licensed under either CC0, CC-BY or CC-BY-NC.
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Pros
Pro Creative Commons licensing
All assets made available through Freesound are required to be licensed under either CC0, CC-BY or CC-BY-NC.
Pro Extensive asset information
Each sample has a details page which includes a waveform view, a full-length audio preview, user-assigned tags, author-assigned "pack" grouping, and an author chain ("remixes and sources") for derivative assets.
Pro Has a selection of free assetts
About 30 free assets are available.
Pro Reasonably priced
Most assets are under $5. The more advanced assets can usually go for around $20-$25.
Cons
Con Some assets may have restrictive licenses
Freesound permits uploaders to select the CC-BY license, which disallows the use of DRM, and the CC-BY-NC license, which disallows commercial use entirely. Licenses are prominently displayed on an asset's details page, and represented by a small icon in list views, but there is no option to filter by asset when searching or browsing.
Con Audio samples and sound effects only
Freesound does not host any kind of non-audio asset.
Choice of music is also scant.
Con Can be used with Game Maker only
Assets are only offered to Game Maker developers.