The best alternatives to Sketch App Sources are Sketch Repo, and Stash. If these 2 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
With Stash, you can browse free Sketch resources, view pages and artboards, and import artboards with a single click. No more downloading entire files just to get an artboard or two.