When comparing GameDev Market vs Freesound, 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 GameDev Market is ranked 6th. 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 Offers a good variety of resource types
GameDev Market includes 2D, 3D, UI, and audio resources.
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.
Cons
Con Personal storefronts could have better discoverability
Currently personal storefronts / seller profiles have a simple list of assets. There are no categories, tags, genre-information, type information, etc that could help narrow the list down.
Con Basic search
Search only matches keywords with titles. No way to search based on type, color, etc.
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.